scsi: pmcraid: use correct size unit when calling find_first_zero_bit()

find_first_zero_bit()'s parameter 'size' is defined in bits, not in
bytes.
Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/pmcraid.c

@@ -5216,7 +5216,7 @@ static unsigned short pmcraid_get_minor(void)
 {
 	int minor;
 
-	minor = find_first_zero_bit(pmcraid_minor, sizeof(pmcraid_minor));
+	minor = find_first_zero_bit(pmcraid_minor, PMCRAID_MAX_ADAPTERS);
 	__set_bit(minor, pmcraid_minor);
 	return minor;
 }