Convert one printk to pr_<level>.

Add a missing newline in several places to avoid message interleaving,
coalesce formats, reflow modified lines to 80 columns.
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NWei Liu <wei.liu2@citrix.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>