gimplefe: Error recovery for invalid declarations [PR117749]

gimplefe: Error recovery for invalid declarations [PR117749]

c_parser_declarator can return null if there was an error,
but c_parser_gimple_declaration was not ready for that.
This fixes that oversight so we don't get an ICE after the error.

Bootstrapped and tested on x86_64-linux-gnu.

	PR c/117749

gcc/c/ChangeLog:

	* gimple-parser.cc (c_parser_gimple_declaration): Check
	declarator to be non-null.

gcc/testsuite/ChangeLog:

	* gcc.dg/gimplefe-55.c: New test.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>