c, c++: Fix two redundantAssignment warnings [PR94629]

This change fixes two obvious redundant assignments reported by cppcheck:
trunk.git/gcc/c/c-parser.c:16969:2: style: Variable 'data.clauses' is reassigned a value before the old one has been used. [redundantAssignment]
trunk.git/gcc/cp/call.c:5116:9: style: Variable 'arg2' is reassigned a value before the old one has been used. [redundantAssignment]

2020-04-17  Jakub Jelinek  <jakub@redhat.com>

	PR other/94629
	* c-parser.c (c_parser_oacc_routine): Remove redundant assignment
	to data.clauses.

	* call.c (build_conditional_expr_1): Remove redundant assignment to
	arg2.