ACPI: AC: Get rid of unnecessary declarations

Drop unnecessary forward declarations of 4 functions and move the
SIMPLE_DEV_PM_OPS() definition after the definition of the resume
callback function.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://patch.msgid.link/3757869.R56niFO833@rafael.j.wysocki

Author: rafaeljw

drivers/acpi/ac.c

@@ -33,22 +33,12 @@ MODULE_AUTHOR("Paul Diefenbaugh");
 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
 MODULE_LICENSE("GPL");
 
-static int acpi_ac_probe(struct platform_device *pdev);
-static void acpi_ac_remove(struct platform_device *pdev);
-
-static void acpi_ac_notify(acpi_handle handle, u32 event, void *data);
-
 static const struct acpi_device_id ac_device_ids[] = {
 	{"ACPI0003", 0},
 	{"", 0},
 };
 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
 
-#ifdef CONFIG_PM_SLEEP
-static int acpi_ac_resume(struct device *dev);
-#endif
-static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
-
 static int ac_sleep_before_get_state_ms;
 static int ac_only;
 
@@ -272,10 +262,10 @@ static int acpi_ac_resume(struct device *dev)
 
 	return 0;
 }
-#else
-#define acpi_ac_resume NULL
 #endif
 
+static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
+
 static void acpi_ac_remove(struct platform_device *pdev)
 {
 	struct acpi_ac *ac = platform_get_drvdata(pdev);