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vp9-svc: Add condition on allocation for scaled_temp.

scaled_temp frame is used as an intermediate buffer for
2 stage down-sampling: two stages of 1/2 down-sampling
for a target of 1/4x1/4. This is used in 3 layer SVC
to avoid duplicate frame downsampling (on middle layer).

As this allocation is only needed/used when the
number_spatial_layers > 2, add this condition to avoid
unneeded allocation for 1 and 2 spatial SVC.

Change-Id: If342466644f685c1ea3ca5344b581793e5136c09

--- a/vp9/encoder/vp9_encoder.c

+++ b/vp9/encoder/vp9_encoder.c

@@ -1121,8 +1121,9 @@

   // For 1 pass cbr: allocate scaled_frame that may be used as an intermediate

   // buffer for a 2 stage down-sampling: two stages of 1:2 down-sampling for a

-  // target of 1/4x1/4.

-  if (is_one_pass_cbr_svc(cpi) && !cpi->svc.scaled_temp_is_alloc) {

+  // target of 1/4x1/4. number_spatial_layers must be greater than 2.

+  if (is_one_pass_cbr_svc(cpi) && !cpi->svc.scaled_temp_is_alloc &&

+      cpi->svc.number_spatial_layers > 2) {

     cpi->svc.scaled_temp_is_alloc = 1;

     if (vpx_realloc_frame_buffer(

             &cpi->svc.scaled_temp, cm->width >> 1, cm->height >> 1,