scsi: fnic: Use vzalloc()

Use vzalloc() instead of hand writing it with vmalloc()+memset().  This is
less verbose.

This also fixes some style issues :)

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/a1179941a6d440140513e681f4f3a1b92c8d83ae.1685210773.git.christophe.jaillet@wanadoo.fr


Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>