Trap divide by 0.

Trap divide by 0 that could occur with a 0 rate target
in aq mode COMPLEXITY_AQ.

Change-Id: I034514f512b2a0db470ae8d37ea395278bf473cf

vp9/encoder/vp9_encodeframe.c

diff --git a/vp9/encoder/vp9_encodeframe.c b/vp9/encoder/vp9_encodeframe.c
index e5d4583..4624a5c 100644
--- a/vp9/encoder/vp9_encodeframe.c
+++ b/vp9/encoder/vp9_encodeframe.c
@@ -380,8 +380,10 @@
       segment = 0;
     }
 
-    complexity_metric =
-      clamp((int)((projected_rate * 64) / target_rate), 16, 255);
+    if (target_rate > 0) {
+      complexity_metric =
+        clamp((int)((projected_rate * 64) / target_rate), 16, 255);
+    }
   }
 
   // Fill in the entires in the segment map corresponding to this SB64