scsi: qla2xxx: Correct the check for sscanf() return value

Since the version string has been modified, sscanf() returns 4 instead of
6.

Link: https://lore.kernel.org/r/20200929102152.32278-2-njavali@marvell.com


Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Saurav Kashyap <skashyap@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>