simplify read_coef_prob()

Change-Id: I529c634db4f81ba5386092c126f53312b1e51b2b

vp9/decoder/vp9_decodframe.c

@@ -552,16 +552,10 @@ static void read_coef_probs_common(vp9_coeff_probs_model *coef_probs,
 
 static void read_coef_probs(FRAME_CONTEXT *fc, TX_MODE tx_mode,
                             vp9_reader *r) {
-  read_coef_probs_common(fc->coef_probs[TX_4X4], r);
-
-  if (tx_mode > ONLY_4X4)
-    read_coef_probs_common(fc->coef_probs[TX_8X8], r);
-
-  if (tx_mode > ALLOW_8X8)
-    read_coef_probs_common(fc->coef_probs[TX_16X16], r);
-
-  if (tx_mode > ALLOW_16X16)
-    read_coef_probs_common(fc->coef_probs[TX_32X32], r);
+    const TX_SIZE max_tx_size = tx_mode_to_biggest_tx_size[tx_mode];
+    TX_SIZE tx_size;
+    for (tx_size = TX_4X4; tx_size <= max_tx_size; ++tx_size)
+      read_coef_probs_common(fc->coef_probs[tx_size], r);
 }
 
 static void setup_segmentation(struct segmentation *seg,