Fix uninitialized variable warning

r6322 introduced a warning pointed out by Jan Kiszka.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6342 c046a42c-6fe2-441c-8c8c-71466251a162
