[SCSI] qla2xxx: handle default case in qla2x00_request_firmware()

This silences a static checker warning.  Also we're always adding new
types of firmware, so it might fix a bug in real life some day.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Acked-by: NChad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

drivers/scsi/qla2xxx/qla_os.c

@@ -4058,7 +4058,6 @@ qla2x00_request_firmware(scsi_qla_host_t *vha)
 	struct qla_hw_data *ha = vha->hw;
 	struct fw_blob *blob;
 
-	blob = NULL;
 	if (IS_QLA2100(ha)) {
 		blob = &qla_fw_blobs[FW_ISP21XX];
 	} else if (IS_QLA2200(ha)) {
@@ -4079,6 +4078,8 @@ qla2x00_request_firmware(scsi_qla_host_t *vha)
 		blob = &qla_fw_blobs[FW_ISP2031];
 	} else if (IS_QLA8031(ha)) {
 		blob = &qla_fw_blobs[FW_ISP8031];
+	} else {
+		return NULL;
 	}
 
 	mutex_lock(&qla_fw_lock);