Initialize local variables to avoid data leak

The uninitialized local variables pick up
whatever the memory content was there on stack.
This data gets sent to the remote process in
case of a failed transaction, which is a security
issue. Fixed.

(Manual merge of master change
 12ba0f57 )

For b/23696300

Change-Id: I665212d10da56f0803b5bb772d14c77e632ba2ab