objtool: Re-arrange validate_functions()

In preparation to adding a vmlinux.o specific pass, rearrange some
code. No functional changes intended.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20200324160924.924304616@infradead.org

tools/objtool/check.c

@@ -2395,9 +2395,8 @@ static bool ignore_unreachable_insn(struct instruction *insn)
 	return false;
 }
 
-static int validate_functions(struct objtool_file *file)
+static int validate_section(struct objtool_file *file, struct section *sec)
 {
-	struct section *sec;
 	struct symbol *func;
 	struct instruction *insn;
 	struct insn_state state;
@@ -2410,7 +2409,6 @@ static int validate_functions(struct objtool_file *file)
 	       CFI_NUM_REGS * sizeof(struct cfi_reg));
 	state.stack_size = initial_func_cfi.cfa.offset;
 
-	for_each_sec(file, sec) {
 	list_for_each_entry(func, &sec->symbol_list, list) {
 		if (func->type != STT_FUNC)
 			continue;
@@ -2435,7 +2433,17 @@ static int validate_functions(struct objtool_file *file)
 			BT_FUNC("<=== (func)", insn);
 		warnings += ret;
 	}
-	}
+
+	return warnings;
+}
+
+static int validate_functions(struct objtool_file *file)
+{
+	struct section *sec;
+	int warnings = 0;
+
+	for_each_sec(file, sec)
+		warnings += validate_section(file, sec);
 
 	return warnings;
 }