scsi: message: fusion: Use BUG_ON instead of if condition followed by BUG

BUG_ON() uses unlikely in if() which can be optimized at compile time.

Link: https://lore.kernel.org/r/1617108361-6870-1-git-send-email-zhouchuangao@vivo.com


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