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Allocate four |zcoeff_blk| for sub8x8 contexts.

The RD and load save/code grabs it as groups of four. In practice there
is no change to physical allocations becaquse this is backed by a 16-byte
memalign.

Change-Id: I01e89769872300e23227e03dd24a6e229f482025

--- a/vp9/encoder/vp9_context_tree.c

+++ b/vp9/encoder/vp9_context_tree.c

@@ -26,7 +26,7 @@

   ctx->num_4x4_blk = num_blk;

   CHECK_MEM_ERROR(cm, ctx->zcoeff_blk,

-                  vpx_calloc(num_4x4_blk, sizeof(uint8_t)));

+                  vpx_calloc(num_blk, sizeof(uint8_t)));

   for (i = 0; i < MAX_MB_PLANE; ++i) {

     for (k = 0; k < 3; ++k) {

       CHECK_MEM_ERROR(cm, ctx->coeff[i][k],