scsi: qla2xxx: check for kstrtol() failure

The error handling was unintentionally left out so it introduces a Smatch
static checker warning:

    drivers/scsi/qla2xxx/qla_attr.c:1655 qla2x00_port_speed_store()
    error: uninitialized symbol 'type'.

Fixes: a7b9ca7fc87a ("scsi: qla2xxx: Add support for setting port speed")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_attr.c

@@ -1652,6 +1652,8 @@ qla2x00_port_speed_store(struct device *dev, struct device_attribute *attr,
 	}
 
 	rval = kstrtol(buf, 10, &type);
+	if (rval)
+		return rval;
 	speed = type;
 	if (type == 40 || type == 80 || type == 160 ||
 	    type == 320) {