ada: Refactor s-pack* units to remove multiple returns

The aim of this refactoring is to replace multiple returns from
branches of case and if statements by a single return statement
with a conditional expression. This is more readable and
maintainable, and also conformant with a Highly Recommended
design principle of ISO 26262-6.

gcc/ada/

	* libgnat/s-pack03.adb: Update copyright year; refactor return statements.
	* libgnat/s-pack05.adb: Likewise.
	* libgnat/s-pack06.adb: Likewise.
	* libgnat/s-pack07.adb: Likewise.
	* libgnat/s-pack09.adb: Likewise.
	* libgnat/s-pack10.adb: Likewise.
	* libgnat/s-pack100.adb: Likewise.
	* libgnat/s-pack101.adb: Likewise.
	* libgnat/s-pack102.adb: Likewise.
	* libgnat/s-pack103.adb: Likewise.
	* libgnat/s-pack104.adb: Likewise.
	* libgnat/s-pack105.adb: Likewise.
	* libgnat/s-pack106.adb: Likewise.
	* libgnat/s-pack107.adb: Likewise.
	* libgnat/s-pack108.adb: Likewise.
	* libgnat/s-pack109.adb: Likewise.
	* libgnat/s-pack11.adb: Likewise.
	* libgnat/s-pack110.adb: Likewise.
	* libgnat/s-pack111.adb: Likewise.
	* libgnat/s-pack112.adb: Likewise.
	* libgnat/s-pack113.adb: Likewise.
	* libgnat/s-pack114.adb: Likewise.
	* libgnat/s-pack115.adb: Likewise.
	* libgnat/s-pack116.adb: Likewise.
	* libgnat/s-pack117.adb: Likewise.
	* libgnat/s-pack118.adb: Likewise.
	* libgnat/s-pack119.adb: Likewise.
	* libgnat/s-pack12.adb: Likewise.
	* libgnat/s-pack120.adb: Likewise.
	* libgnat/s-pack121.adb: Likewise.
	* libgnat/s-pack122.adb: Likewise.
	* libgnat/s-pack123.adb: Likewise.
	* libgnat/s-pack124.adb: Likewise.
	* libgnat/s-pack125.adb: Likewise.
	* libgnat/s-pack126.adb: Likewise.
	* libgnat/s-pack127.adb: Likewise.
	* libgnat/s-pack13.adb: Likewise.
	* libgnat/s-pack14.adb: Likewise.
	* libgnat/s-pack15.adb: Likewise.
	* libgnat/s-pack17.adb: Likewise.
	* libgnat/s-pack18.adb: Likewise.
	* libgnat/s-pack19.adb: Likewise.
	* libgnat/s-pack20.adb: Likewise.
	* libgnat/s-pack21.adb: Likewise.
	* libgnat/s-pack22.adb: Likewise.
	* libgnat/s-pack23.adb: Likewise.
	* libgnat/s-pack24.adb: Likewise.
	* libgnat/s-pack25.adb: Likewise.
	* libgnat/s-pack26.adb: Likewise.
	* libgnat/s-pack27.adb: Likewise.
	* libgnat/s-pack28.adb: Likewise.
	* libgnat/s-pack29.adb: Likewise.
	* libgnat/s-pack30.adb: Likewise.
	* libgnat/s-pack31.adb: Likewise.
	* libgnat/s-pack33.adb: Likewise.
	* libgnat/s-pack34.adb: Likewise.
	* libgnat/s-pack35.adb: Likewise.
	* libgnat/s-pack36.adb: Likewise.
	* libgnat/s-pack37.adb: Likewise.
	* libgnat/s-pack38.adb: Likewise.
	* libgnat/s-pack39.adb: Likewise.
	* libgnat/s-pack40.adb: Likewise.
	* libgnat/s-pack41.adb: Likewise.
	* libgnat/s-pack42.adb: Likewise.
	* libgnat/s-pack43.adb: Likewise.
	* libgnat/s-pack44.adb: Likewise.
	* libgnat/s-pack45.adb: Likewise.
	* libgnat/s-pack46.adb: Likewise.
	* libgnat/s-pack47.adb: Likewise.
	* libgnat/s-pack48.adb: Likewise.
	* libgnat/s-pack49.adb: Likewise.
	* libgnat/s-pack50.adb: Likewise.
	* libgnat/s-pack51.adb: Likewise.
	* libgnat/s-pack52.adb: Likewise.
	* libgnat/s-pack53.adb: Likewise.
	* libgnat/s-pack54.adb: Likewise.
	* libgnat/s-pack55.adb: Likewise.
	* libgnat/s-pack56.adb: Likewise.
	* libgnat/s-pack57.adb: Likewise.
	* libgnat/s-pack58.adb: Likewise.
	* libgnat/s-pack59.adb: Likewise.
	* libgnat/s-pack60.adb: Likewise.
	* libgnat/s-pack61.adb: Likewise.
	* libgnat/s-pack62.adb: Likewise.
	* libgnat/s-pack63.adb: Likewise.
	* libgnat/s-pack65.adb: Likewise.
	* libgnat/s-pack66.adb: Likewise.
	* libgnat/s-pack67.adb: Likewise.
	* libgnat/s-pack68.adb: Likewise.
	* libgnat/s-pack69.adb: Likewise.
	* libgnat/s-pack70.adb: Likewise.
	* libgnat/s-pack71.adb: Likewise.
	* libgnat/s-pack72.adb: Likewise.
	* libgnat/s-pack73.adb: Likewise.
	* libgnat/s-pack74.adb: Likewise.
	* libgnat/s-pack75.adb: Likewise.
	* libgnat/s-pack76.adb: Likewise.
	* libgnat/s-pack77.adb: Likewise.
	* libgnat/s-pack78.adb: Likewise.
	* libgnat/s-pack79.adb: Likewise.
	* libgnat/s-pack80.adb: Likewise.
	* libgnat/s-pack81.adb: Likewise.
	* libgnat/s-pack82.adb: Likewise.
	* libgnat/s-pack83.adb: Likewise.
	* libgnat/s-pack84.adb: Likewise.
	* libgnat/s-pack85.adb: Likewise.
	* libgnat/s-pack86.adb: Likewise.
	* libgnat/s-pack87.adb: Likewise.
	* libgnat/s-pack88.adb: Likewise.
	* libgnat/s-pack89.adb: Likewise.
	* libgnat/s-pack90.adb: Likewise.
	* libgnat/s-pack91.adb: Likewise.
	* libgnat/s-pack92.adb: Likewise.
	* libgnat/s-pack93.adb: Likewise.
	* libgnat/s-pack94.adb: Likewise.
	* libgnat/s-pack95.adb: Likewise.
	* libgnat/s-pack96.adb: Likewise.
	* libgnat/s-pack97.adb: Likewise.
	* libgnat/s-pack98.adb: Likewise.
	* libgnat/s-pack99.adb: Likewise.