drm/drm_mm.h: Fix the name of the referenced function in comment

drm_mm_insert_node_generic() is a simplified version of
drm_mm_insert_node_in_range(), update comment to reflect correct
function name.
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171101140445.2798-1-Liviu.Dudau@arm.com

include/drm/drm_mm.h

@@ -386,7 +386,7 @@ int drm_mm_insert_node_in_range(struct drm_mm *mm,
  * @color: opaque tag value to use for this node
  * @mode: fine-tune the allocation search and placement
  *
- * This is a simplified version of drm_mm_insert_node_in_range_generic() with no
+ * This is a simplified version of drm_mm_insert_node_in_range() with no
  * range restrictions applied.
  *
  * The preallocated node must be cleared to 0.