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vp9/vp9_cx_iface: Silence ts_number_layers MSVC warnings

Silence signed/unsigned mismatch warnings by adding casts where
ts_number_layers does not match the sign of the variable to which
it is being compared.

Change-Id: Iab25e18c877d158b2b2b417de7da94669648b2fa

--- a/vp9/vp9_cx_iface.c

+++ b/vp9/vp9_cx_iface.c

@@ -178,7 +178,7 @@

   RANGE_CHECK(cfg, ts_number_layers, 1, VPX_TS_MAX_LAYERS);

   if (cfg->ts_number_layers > 1) {

-    int i;

+    unsigned int i;

     for (i = 1; i < cfg->ts_number_layers; ++i) {

       if (cfg->ts_target_bitrate[i] < cfg->ts_target_bitrate[i-1]) {

         ERROR("ts_target_bitrate entries are not increasing");

@@ -1045,7 +1045,7 @@

   cpi->svc.temporal_layer_id = data->temporal_layer_id;

   // Checks on valid layer_id input.

   if (cpi->svc.temporal_layer_id < 0 ||

-      cpi->svc.temporal_layer_id >= ctx->cfg.ts_number_layers) {

+      cpi->svc.temporal_layer_id >= (int)ctx->cfg.ts_number_layers) {

     return VPX_CODEC_INVALID_PARAM;

   }

   if (cpi->svc.spatial_layer_id < 0 ||

-- 

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