Coverity flags that 'portal' variable is used before
it's checked for NULL. This patch fixes this issue.
Coverity issue: 323516
Fixes: 4ab57b042e7c ("event/dpaa2: affine portal at runtime during I/O")
Cc: stable@dpdk.org
Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
Acked-by: Nipun Gupta <nipun.gupta@nxp.com>