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VP9: remove plane_type checks in loopfilter functions

vp9_filter_block_plane_ss11() and vp9_filter_block_plane_non420()
are only called for the uv planes.

Change-Id: Iacd3b3242c8ce581edd37c8f06d95efc8a0f88a3

--- a/vp9/common/vp9_loopfilter.c

+++ b/vp9/common/vp9_loopfilter.c

@@ -1196,9 +1196,7 @@

       const int block_edge_above = (num_4x4_blocks_high_lookup[sb_type] > 1) ?

           !(r & (num_8x8_blocks_high_lookup[sb_type] - 1)) : 1;

       const int skip_this_r = skip_this && !block_edge_above;

-      const TX_SIZE tx_size = (plane->plane_type == PLANE_TYPE_UV)

-                            ? get_uv_tx_size(&mi[0].mbmi, plane)

-                            : mi[0].mbmi.tx_size;

+      const TX_SIZE tx_size = get_uv_tx_size(&mi[0].mbmi, plane);

       const int skip_border_4x4_c = ss_x && mi_col + c == cm->mi_cols - 1;

       const int skip_border_4x4_r = ss_y && mi_row + r == cm->mi_rows - 1;

@@ -1446,11 +1444,9 @@

   // Vertical pass: do 2 rows at one time

   for (r = 0; r < MI_BLOCK_SIZE && mi_row + r < cm->mi_rows; r += 4) {

-    if (plane->plane_type == 1) {

-      for (c = 0; c < (MI_BLOCK_SIZE >> 1); c++) {

-        lfl_uv[(r << 1) + c] = lfm->lfl_y[(r << 3) + (c << 1)];

-        lfl_uv[((r + 2) << 1) + c] = lfm->lfl_y[((r + 2) << 3) + (c << 1)];

-      }

+    for (c = 0; c < (MI_BLOCK_SIZE >> 1); c++) {

+      lfl_uv[(r << 1) + c] = lfm->lfl_y[(r << 3) + (c << 1)];

+      lfl_uv[((r + 2) << 1) + c] = lfm->lfl_y[((r + 2) << 3) + (c << 1)];

     }

     {