rdopt: fix wrong #endif

The comment after the affected #endif was incorrect. This patch updates
it so that it reflects the condition that it ends.

Change-Id: Ib5c39a9444e72b2582301d9e4b03d3c56f9cf304
diff --git a/av1/encoder/rdopt.c b/av1/encoder/rdopt.c
index b01919c..268426c 100644
--- a/av1/encoder/rdopt.c
+++ b/av1/encoder/rdopt.c
@@ -1209,7 +1209,7 @@
 
   return cost;
 }
-#endif  // !CONFIG_PVQ
+#endif  // !CONFIG_PVQ || CONFIG_VAR_TX
 
 static void dist_block(const AV1_COMP *cpi, MACROBLOCK *x, int plane, int block,
                        int blk_row, int blk_col, TX_SIZE tx_size,