scsi: fnic: use kzalloc in fnic_fcoe_process_vlan_resp

This saves a little .text and gets rid of the unmotivated line break and
the sizeof(...) style inconsistency.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>