[media] gspca: Remove the useless variable 'nbalt'

As the alternate settings are now sorted in gspca main,
the variable 'nbalt' is no more useful.

Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/gspca/benq.c b/drivers/media/video/gspca/benq.c
index 1d1a412..390291c 100644
--- a/drivers/media/video/gspca/benq.c
+++ b/drivers/media/video/gspca/benq.c
@@ -134,13 +134,17 @@
 
 static void sd_stopN(struct gspca_dev *gspca_dev)
 {
+	struct usb_interface *intf;
+
 	reg_w(gspca_dev, 0x003c, 0x0003);
 	reg_w(gspca_dev, 0x003c, 0x0004);
 	reg_w(gspca_dev, 0x003c, 0x0005);
 	reg_w(gspca_dev, 0x003c, 0x0006);
 	reg_w(gspca_dev, 0x003c, 0x0007);
+
+	intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 	usb_set_interface(gspca_dev->dev, gspca_dev->iface,
-					gspca_dev->nbalt - 1);
+					intf->num_altsetting - 1);
 }
 
 static void sd_pkt_scan(struct gspca_dev *gspca_dev,