There existed about a 1 in 4 billion chance that reading from /dev/urandom

would return LONG_MIN (1 in 9 quintillion if using 64-bit longs). Since there
is no positive equivalent of LONG_MIN, the result of labs() in this case is
unpredictable. This fixes that situation.

(closes issue #11336, reported and patched by sperreault)



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@89487 65c4cc65-6c06-0410-ace0-fbb531ad65f3