ACPI / video: mark acpi_video_get_levels() inline

A recent patch added a stub function for acpi_video_get_levels when
CONFIG_ACPI_VIDEO is disabled. However, this is marked as 'static'
and causes a warning about an unused function whereever the header
gets included:

In file included from ../drivers/gpu/drm/radeon/radeon_acpi.c:28:0:
include/acpi/video.h:74:12: error: 'acpi_video_get_levels' defined but not used [-Werror=unused-function]

This makes the declaration 'static inline', which gets rid of the
warning.

Signed-off-by: Arnd Bergmann <[e-mail]>
Fixes: 059500940def (ACPI/video: export acpi_video_get_levels)
Signed-off-by: Rafael J. Wysocki <[e-mail]>

include/acpi/video.h

···
 {
 	return false;
 }
-static int acpi_video_get_levels(struct acpi_device *device,
+static inline int acpi_video_get_levels(struct acpi_device *device,
 			struct acpi_video_device_brightness **dev_br)
 {
 	return -ENODEV;