drm: drop return value of drm_free_agp

No caller (rightly) cares about it, so drop it.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_memory.c b/drivers/gpu/drm/drm_memory.c
index 7732268..70ca27ed 100644
--- a/drivers/gpu/drm/drm_memory.c
+++ b/drivers/gpu/drm/drm_memory.c
@@ -106,9 +106,9 @@
 }
 
 /** Wrapper around agp_free_memory() */
-int drm_free_agp(DRM_AGP_MEM * handle, int pages)
+void drm_free_agp(DRM_AGP_MEM * handle, int pages)
 {
-	return drm_agp_free_memory(handle) ? 0 : -EINVAL;
+	drm_agp_free_memory(handle);
 }
 EXPORT_SYMBOL(drm_free_agp);