Fix leak of SRPC string argument template buffers
Fix leak of SRPC string argument template buffers

The caller of an RPC allocates an empty string in a NaClSrpcArg
for each out parameter of string type.  Then receiving the reply
ignores this buffer and allocates a new one.  The old buffer
needs to be freed.

BUG= none
TEST= trybots
R=sehr@chromium.org

Review URL: https://codereview.chromium.org/317653004

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@13320 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client