Fix some minor issues picked up by valgrind.

Standalone bcc was leaking memory due to misuse of OwningPtr.
RSInfo was not clearing a buffer before using only part of it. The
whole buffer was being written out in the resulting file, however.

Change-Id: Icd455748f81a06d022f1e5ed83a2ab1cae3fef09
diff --git a/lib/Renderscript/RSInfo.cpp b/lib/Renderscript/RSInfo.cpp
index 9d924ca..5bca5e6 100644
--- a/lib/Renderscript/RSInfo.cpp
+++ b/lib/Renderscript/RSInfo.cpp
@@ -251,6 +251,7 @@
       ALOGE("Out of memory when allocate memory for string pool in RSInfo "
             "constructor (size: %u)!", mHeader.strPoolSize);
     }
+    ::memset(mStringPool, 0, mHeader.strPoolSize);
   }
 }