Fix memory leak on wifi

Google: 3425623
Change-Id: I5cd3c427280ebb2e8ed1b18d39d1b29c962b7658
Signed-off-by: Jia Jia <jia.jia@zte.com.cn>

src/com/android/settings/wifi/WifiEntryPreference.java

@@ -262,7 +262,13 @@ public class WifiEntryPreference extends RestrictedPreference implements
             // Fallback for platforms that do not need friction icon resources.
             frictionSld = null;
         }
-        return frictionSld != null ? (StateListDrawable) frictionSld.getDrawable(0) : null;
+        if (frictionSld != null) {
+            StateListDrawable val = (StateListDrawable) frictionSld.getDrawable(0);
+            frictionSld.recycle();
+            return val;
+        } else {
+            return null;
+        }
     }
 
     /**