re PR c++/37217 (-Wconversion causes ICE with __builtin_strcmp with one char compare)

2008-08-27  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

	PR 37217
	* c-common.c (conversion_warning): Check for null operands.
testsuite/
	* gcc.dg/pr37217.c: New.

From-SVN: r139682