calculate the number of bytes from a sysinfo structure.
unsigned long.

(closes issue #13057)
Reported by: eliel
Patches:
      asterisk.c.patch uploaded by eliel (license 64)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@131445 65c4cc65-6c06-0410-ace0-fbb531ad65f3