ntb_hw_switchtec: Make function switchtec_ntb_remove() static

Fixes the following sparse warnings:

drivers/ntb/hw/mscc/ntb_hw_switchtec.c:1552:6: warning:
 symbol 'switchtec_ntb_remove' was not declared. Should it be static?

Signed-off-by: Wei Yongjun <[email protected]>
Reviewed-by: Logan Gunthorpe <[email protected]>
Signed-off-by: Jon Mason <[email protected]>

Author: Wei Yongjun

ntb_hw_switchtec.c

@@ -1519,8 +1519,8 @@ static int switchtec_ntb_add(struct device *dev,
 	return rc;
 }
 
-void switchtec_ntb_remove(struct device *dev,
-			  struct class_interface *class_intf)
+static void switchtec_ntb_remove(struct device *dev,
+				 struct class_interface *class_intf)
 {
 	struct switchtec_dev *stdev = to_stdev(dev);
 	struct switchtec_ntb *sndev = stdev->sndev;