gmi.c:
Get rid of valgrind warning and possible segfault.

BKrev: 414f7c5cf4HwWODMiTAI2PCkLX1fnw


git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@270 fd59a12c-fef9-0310-b244-a6a79926bd2f