objtool: Remove error handling boilerplate

objtool: Remove error handling boilerplate

Up to a certain point in objtool's execution, all errors are fatal and
return -1.  When propagating such errors, just return -1 directly
instead of trying to propagate the original return code.  This helps
make the code more compact and the behavior more explicit.

Acked-by: Petr Mladek <pmladek@suse.com>
Tested-by: Joe Lawrence <joe.lawrence@redhat.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>