scsi: libfc: Fix for double free()

Fix for '&fp->skb' double free.

Link:
https://lore.kernel.org/r/20200825093940.19612-1-jhasan@marvell.com


Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Javed Hasan <jhasan@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>