scsi: fnic: Replace memset() with eth_zero_addr()

Use eth_zero_addr() to assign the zero address to the given address array
instead of memset() when second argument is address of zero.

Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Link: https://lore.kernel.org/r/20250519085457.918720-1-nichen@iscas.ac.cn


Reviewed-by: Karan Tilak Kumar <kartilak@cisco.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>