netxen_nic: remove redundant check if retries is zero

At the end of the timeout loop, retries will always be zero so
the check for zero is redundant so remove it.  Also replace
printk with pr_err as recommended by checkpatch.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>