trivial: replace last usages of __FUNCTION__ in kernel

__FUNCTION__ is gcc-specific, use __func__

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 53c8725..5b2cbb7 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -210,7 +210,7 @@
 	int ret;
 
 	WARN(!mutex_is_locked(&dev->mode_config.mutex),
-	     "%s called w/o mode_config lock\n", __FUNCTION__);
+	     "%s called w/o mode_config lock\n", __func__);
 again:
 	if (idr_pre_get(&dev->mode_config.crtc_idr, GFP_KERNEL) == 0) {
 		DRM_ERROR("Ran out memory getting a mode number\n");