libvpx: Fix some warnings.

Change-Id: If8be8b9d28a29631f29c46daea8a226ab3580610

vp9/decoder/vp9_decodframe.c

@@ -684,7 +684,7 @@ static void decode_4x4_sb(VP9D_COMP *pbi, MACROBLOCKD *xd,
 };
 
 static void decode_superblock64(VP9D_COMP *pbi, MACROBLOCKD *xd,
-                                int mb_row, unsigned int mb_col,
+                                int mb_row, int mb_col,
                                 BOOL_DECODER* const bc) {
   int i, n, eobtotal;
   TX_SIZE tx_size = xd->mode_info_context->mbmi.txfm_size;
@@ -810,7 +810,7 @@ static void decode_superblock64(VP9D_COMP *pbi, MACROBLOCKD *xd,
 }
 
 static void decode_superblock32(VP9D_COMP *pbi, MACROBLOCKD *xd,
-                                int mb_row, unsigned int mb_col,
+                                int mb_row, int mb_col,
                                 BOOL_DECODER* const bc) {
   int i, n, eobtotal;
   TX_SIZE tx_size = xd->mode_info_context->mbmi.txfm_size;

vp9/encoder/vp9_lookahead.c

@@ -174,7 +174,7 @@ vp9_lookahead_peek(struct lookahead_ctx *ctx,
                    int                   index) {
   struct lookahead_entry *buf = NULL;
 
-  assert(index < ctx->max_sz);
+  assert(index < (int)ctx->max_sz);
   if (index < (int)ctx->sz) {
     index += ctx->read_idx;
     if (index >= (int)ctx->max_sz)

vp9/encoder/vp9_rdopt.c

@@ -847,7 +847,7 @@ static int vp9_sb_block_error_c(int16_t *coeff, int16_t *dqcoeff,
     error += this_diff * this_diff;
   }
 
-  return error > INT_MAX ? INT_MAX : error;
+  return error > INT_MAX ? INT_MAX : (int)error;
 }
 
 #define DEBUG_ERROR 0
@@ -3123,9 +3123,9 @@ static void store_coding_context(MACROBLOCK *x, PICK_MODE_CONTEXT *ctx,
   ctx->best_ref_mv.as_int = ref_mv->as_int;
   ctx->second_best_ref_mv.as_int = second_ref_mv->as_int;
 
-  ctx->single_pred_diff = comp_pred_diff[SINGLE_PREDICTION_ONLY];
-  ctx->comp_pred_diff   = comp_pred_diff[COMP_PREDICTION_ONLY];
-  ctx->hybrid_pred_diff = comp_pred_diff[HYBRID_PREDICTION];
+  ctx->single_pred_diff = (int)comp_pred_diff[SINGLE_PREDICTION_ONLY];
+  ctx->comp_pred_diff   = (int)comp_pred_diff[COMP_PREDICTION_ONLY];
+  ctx->hybrid_pred_diff = (int)comp_pred_diff[HYBRID_PREDICTION];
 
   memcpy(ctx->txfm_rd_diff, txfm_size_diff, sizeof(ctx->txfm_rd_diff));
 }