av1_subtract_block(): Move "(void)bd_info;"

Change-Id: I4571bbb488532148171ac86f5efe218ee5903e05

av1/encoder/encodemb.c

diff --git a/av1/encoder/encodemb.c b/av1/encoder/encodemb.c
index 537956a..8853651 100644
--- a/av1/encoder/encodemb.c
+++ b/av1/encoder/encodemb.c
@@ -40,7 +40,6 @@
                         ptrdiff_t src_stride, const uint8_t *pred8,
                         ptrdiff_t pred_stride) {
   assert(rows >= 4 && cols >= 4);
-  (void)bd_info;
 #if CONFIG_AV1_HIGHBITDEPTH
   if (bd_info.use_highbitdepth_buf) {
     aom_highbd_subtract_block(rows, cols, diff, diff_stride, src8, src_stride,
@@ -48,6 +47,7 @@
     return;
   }
 #endif
+  (void)bd_info;
   aom_subtract_block(rows, cols, diff, diff_stride, src8, src_stride, pred8,
                      pred_stride);
 }