Fix a bug in Q pick

Change-Id: Ic8016a0a9ce6da39a5735e9bb9de866e0cc60fb4

av1/encoder/ratectrl.c

diff --git a/av1/encoder/ratectrl.c b/av1/encoder/ratectrl.c
index fda08a3..a13c4d8 100644
--- a/av1/encoder/ratectrl.c
+++ b/av1/encoder/ratectrl.c
@@ -1231,7 +1231,7 @@
         q = active_worst_quality;
     }
   }
-  clamp(q, active_best_quality, active_worst_quality);
+  q = clamp(q, active_best_quality, active_worst_quality);
 
   *active_best = active_best_quality;
   *active_worst = active_worst_quality;