Fix crash in MyHandler when sockets are not set.

-When going quickly in and out of the video view during an rtsp
streaming session, a race condition occurs and MyHandler tries to
connect to a socket that has been reset. To avoid this,
checks are added.
- If there are errors during setupTrack 1, it is no use
setting up track 2. It will cause new errors.
- No assert for socket connect since there is a normal
status check already.

Change-Id: Ie06221d6c0d78ce0449f76c782ed5120fa646bfd