objtool: Append "()" to function name in "unexpected end of section" warning

Append with "()" to clarify it's a function.

Before:

  vmlinux.o: warning: objtool: cdns_mrvl_xspi_setup_clock: unexpected end of section .text.cdns_mrvl_xspi_setup_clock

After:

  vmlinux.o: warning: objtool: cdns_mrvl_xspi_setup_clock(): unexpected end of section .text.cdns_mrvl_xspi_setup_clock

Fixes: c5995ab ("objtool: Improve error handling")
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/692e1e0d0b15a71bd35c6b4b87f3c75cd5a57358.1743481539.git.jpoimboe@kernel.org

Author: jpoimboe

tools/objtool/check.c

@@ -3761,7 +3761,7 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
 				return 0;
 
 			WARN("%s%sunexpected end of section %s",
-			     func ? func->name : "", func ? ": " : "",
+			     func ? func->name : "", func ? "(): " : "",
 			     sec->name);
 			return 1;
 		}