objtool: Don't print parentheses in function addresses

The parentheses in the "func()+off" address output are inconsistent with
how the kernel prints function addresses, breaking Peter's scripts.
Remove them.
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/f2bec70312f62ef4f1ea21c134d9def627182ad3.1650300597.git.jpoimboe@redhat.com

tools/objtool/include/objtool/warn.h

@@ -33,11 +33,7 @@ static inline char *offstr(struct section *sec, unsigned long offset)
 	}
 
 	str = malloc(strlen(name) + 20);
-
-	if (func)
-		sprintf(str, "%s()+0x%lx", name, name_off);
-	else
-		sprintf(str, "%s+0x%lx", name, name_off);
+	sprintf(str, "%s+0x%lx", name, name_off);
 
 	return str;
 }