net/mlx5: fix assertion on flags set in packet mbuf

net/mlx5: fix assertion on flags set in packet mbuf

Fixed the assertion on the flags set in pkt->ol_flags for vectorized
MPRQ.  With vectorized MPRQ the CQs are processed before copying the
MPRQ bufs so the valid assertion is that the expected flag is set and
not that the pkt->ol_flags equlas this flag alone.

Fixes: 0f20acbf5eda ("net/mlx5: implement vectorized MPRQ burst")
Cc: stable@dpdk.org
Signed-off-by: Lior Margalit <lmargalit@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>