vfio: fix uninitialized variable
vfio: fix uninitialized variable

Some static analyzers complain about it, even though
value is never used if not initialized. To avoid additional
false positives about a potential null-pointer dereferences,
also add a null-check.

Bugzilla ID: 58
Fixes: ea2dc1066870 ("vfio: add multi container support")
Cc: stable@dpdk.org

Signed-off-by: Anatoly Burakov <814e00d8f6e4e81b7ccc7e3e5a0bfec0078f0203@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk