GCC9 gives warnings if the parameter passed to printf for "%s" could be
NULL, so we need to add checks in some cases to ensure that is not the
case.
Fixes: 61c592a8d035 ("raw/skeleton: introduce skeleton rawdev driver")
Cc: stable@dpdk.org
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
3a66890a8a