vp9_loopfilter.c : fix / clarify todo

Change-Id: Ie3ec67a83d1877d3deae9c7922b6899d915aa19e

vp9/common/vp9_loopfilter.c

diff --git a/vp9/common/vp9_loopfilter.c b/vp9/common/vp9_loopfilter.c
index f5fd745..2d98e77 100644
--- a/vp9/common/vp9_loopfilter.c
+++ b/vp9/common/vp9_loopfilter.c
@@ -1547,7 +1547,7 @@
 
       vp9_setup_dst_planes(planes, frame_buffer, mi_row, mi_col);
 
-      // TODO(JBB): Make setup_mask work for non 420.
+      // TODO(jimbankoski): For 444 only need to do y mask.
       vp9_adjust_mask(cm, mi_row, mi_col, lfm);
 
       vp9_filter_block_plane_ss00(cm, &planes[0], mi_row, lfm);