scsi: qla2xxx: fx00 copypaste typo

Fix an obvious copy-paste error in freeing QLAFX00 response queue - the
code checked for rsp->ring but freed rsp->ring_fx00.

[mkp: applied by hand]

Signed-off-by: Meelis Roos <mroos@linux.ee>
Acked-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>