IAX2: Transfer Reject: Lock bridgecallno before touching it, refactor

1). When touching the bridgecallno, we need to lock it.

2). Remove magic number '0' and replace with TRANSFER_NONE.

3). Exit early if no bridgecallno.

4). Reduce indentation.

Reported by: alecdavis
Tested by: alecdavis
alecdavis (license 585)

Review https://reviewboard.asterisk.org/r/2613/
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Merged revisions 391333 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 391334 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@391335 65c4cc65-6c06-0410-ace0-fbb531ad65f3