ASACORE-1072 Cleaned up memory leak in the MsgArgTest code

Since the unit test was not using deep ownership of the values
passed into the MsgArg there was no reason to expect it to
clean those values.

Change-Id: Iaa64f180af69ab1384994e9fd2aff5785bbd91c9
Signed-off-by: George Nash <georgen@qce.qualcomm.com>
Merge "ASACORE-1072 Cleaned up memory leak in the MsgArgTest code"