SIP TCP and TLS transports may call send completion callback with bytes_set=0 when send operation fails because outgoing connection is cancelled (for example, application quits). This will trigger assertion error in transaction because transaction only expects positive or negative bytes_set number, but not zero

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@1551 74dad513-b988-da41-8d7b-12977e46ad98
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