Break motion mode loop if a skip block is found

Change-Id: Id06039f5a5d6a311c73384d03929506548e8de68
diff --git a/av1/encoder/rdopt.c b/av1/encoder/rdopt.c
index af40ddb..7c33083 100644
--- a/av1/encoder/rdopt.c
+++ b/av1/encoder/rdopt.c
@@ -7934,6 +7934,7 @@
              sizeof(x->blk_skip[0]) * xd->n8_h * xd->n8_w);
       best_xskip = x->skip;
       best_disable_skip = *disable_skip;
+      if (best_xskip) break;
     }
   }
   mbmi->ref_frame[1] = ref_frame_1;