Handle OOM errors more gracefully.

(closes issue #17084)
 Reported by: falves11
 Patches: 
       issue17084_162_A.diff uploaded by falves11 (license 374)
 Tested by: falves11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@267669 65c4cc65-6c06-0410-ace0-fbb531ad65f3