objtool: Don't consider vmlinux a C-file

Avoids issuing C-file warnings for vmlinux.

Signed-off-by: Peter Zijlstra (Intel) <[e-mail]>
Link: https://lkml.kernel.org/r/[e-mail]

tools/objtool/check.c

···
 
 	INIT_LIST_HEAD(&file.insn_list);
 	hash_init(file.insn_hash);
-	file.c_file = find_section_by_name(file.elf, ".comment");
+	file.c_file = !vmlinux && find_section_by_name(file.elf, ".comment");
 	file.ignore_unreachables = no_unreachable;
 	file.hints = false;