Fix conflict between txmg exp and hbd mode

Change-Id: I5558e18c8c706474df28e51e6ac9f598e0e2ab48

av1/common/idct.c

@@ -2247,7 +2247,11 @@ void av1_inverse_transform_block(const MACROBLOCKD *xd,
   txfm_param.mode = mode;
 #endif
 
+  const int is_hbd = get_bitdepth_data_path_index(xd);
 #if CONFIG_TXMG
+  if (is_hbd) {
+    av1_highbd_inv_txfm_add(dqcoeff, dst, stride, &txfm_param);
+  } else {
     DECLARE_ALIGNED(16, uint16_t, tmp[MAX_TX_SQUARE]);
     int tmp_stride = MAX_TX_SIZE;
     int w = tx_size_wide[tx_size];
@@ -2266,8 +2270,8 @@ void av1_inverse_transform_block(const MACROBLOCKD *xd,
         dst[r * stride + c] = tmp[r * tmp_stride + c];
       }
     }
+  }
 #else  // CONFIG_TXMG
-  const int is_hbd = get_bitdepth_data_path_index(xd);
   inv_txfm_func[is_hbd](dqcoeff, dst, stride, &txfm_param);
 #endif  // CONFIG_TXMG
 }