Fix a crash when logging

b/13400199

Change-Id: Idec67693d6d1edfe0bfcac26cb8e3433ab19ad54
diff --git a/src/com/android/exchange/adapter/Serializer.java b/src/com/android/exchange/adapter/Serializer.java
index 3511c88..4cd187e 100644
--- a/src/com/android/exchange/adapter/Serializer.java
+++ b/src/com/android/exchange/adapter/Serializer.java
@@ -82,7 +82,7 @@
         if (cr > 0) {
             str = str.substring(0, cr);
         }
-        LogUtils.v(TAG, str);
+        LogUtils.v(TAG, "%s", str);
         if (Eas.FILE_LOG) {
             FileLogger.log(TAG, str);
         }