net/af_xdp: add missing trailing newline in logs

net/af_xdp: add missing trailing newline in logs

Caught while trying --in-memory mode, some log messages in this driver
are not terminated with a newline:
rte_pmd_af_xdp_probe(): net_af_xdp: Failed to register multi-process IPC
callback: Operation not supportedvdev_probe(): failed to initialize
net_af_xdp device

Other locations in this driver had the same issue, fix all at once.

Fixes: f1debd77efaf ("net/af_xdp: introduce AF_XDP PMD")
Fixes: d8a210774e1d ("net/af_xdp: support unaligned umem chunks")
Fixes: 9876cf8316b3 ("net/af_xdp: re-enable secondary process support")
Cc: stable@dpdk.org
Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Ciara Loftus <ciara.loftus@intel.com>