Adjust block matching size

The coding performance for A1 set is improved by -0.45% in PSNR
BD-rate.

Change-Id: I7df63fe264628e8bbeebb362866dae3fb65ccdd4

av1/encoder/temporal_filter.c

diff --git a/av1/encoder/temporal_filter.c b/av1/encoder/temporal_filter.c
index b229d43..4f42447 100644
--- a/av1/encoder/temporal_filter.c
+++ b/av1/encoder/temporal_filter.c
@@ -172,7 +172,7 @@
     error = cpi->mv_search_params.find_fractional_mv_step(
         &mb->e_mbd, &cpi->common, &ms_params, subpel_start_mv, &best_mv.as_mv,
         &distortion, &sse, NULL);
-    block_mse = DIVIDE_AND_ROUND(error, mb_pels);
+    block_mse = DIVIDE_AND_ROUND(sse, mb_pels);
     block_mv = best_mv.as_mv;
     *ref_mv = best_mv.as_mv;
     // On 4 sub-blocks.
@@ -213,7 +213,7 @@
         error = cpi->mv_search_params.find_fractional_mv_step(
             &mb->e_mbd, &cpi->common, &ms_params, subpel_start_mv,
             &best_mv.as_mv, &distortion, &sse, NULL);
-        subblock_mses[subblock_idx] = DIVIDE_AND_ROUND(error, subblock_pels);
+        subblock_mses[subblock_idx] = DIVIDE_AND_ROUND(sse, subblock_pels);
         subblock_mvs[subblock_idx] = best_mv.as_mv;
         ++subblock_idx;
       }