testsuite: target test for short_enums

testsuite: target test for short_enums

On arm-none-eabi, the test case fails with below warning on GCC13
.../null-deref-pr108251-smp_fetch_ssl_fc_has_early-O2.c:63:65: warning: converting a packed 'enum obj_type' pointer (alignment 1) to a 'struct connection' pointer (alignment 4) may result in an unaligned pointer value [-Waddress-of-packed-member]

Add a dg-bogus to ensure that the warning is not reintroduced.

gcc/testsuite/ChangeLog:

	* c-c++-common/analyzer/null-deref-pr108251-smp_fetch_ssl_fc_has_early-O2.c:
	Added dg-bogus with target on offending line for short_enums.

Signed-off-by: Torbjörn SVENSSON <torbjorn.svensson@foss.st.com>