selftests/bpf: Add missing va_end.

There is no va_end after va_copy, just add it.

Signed-off-by: Zhang Jiao <[e-mail]>
Signed-off-by: Daniel Borkmann <[e-mail]>
Acked-by: Eduard Zingerman <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alexei Starovoitov <[e-mail]>

tools/testing/selftests/bpf/test_progs.c

···
 
 		va_copy(args2, args);
 		vfprintf(libbpf_capture_stream, format, args2);
+		va_end(args2);
 	}
 
 	if (env.verbosity < VERBOSE_VERY && level == LIBBPF_DEBUG)