drivers/net/usb: fix sparse warnings: Should it be static?

Impact: Make symbols static.

Fix this sparse warnings:
  drivers/net/usb/hso.c:1249:6: warning: symbol 'hso_unthrottle_tasklet' was not declared. Should it be static?
  drivers/net/usb/hso.c:1268:6: warning: symbol 'hso_unthrottle_workfunc' was not declared. Should it be static?
  drivers/net/usb/hso.c:1466:5: warning: symbol 'tiocmget_submit_urb' was not declared. Should it be static?
  drivers/net/usb/smsc95xx.c:62:5: warning: symbol 'turbo_mode' was not declared. Should it be static?
Signed-off-by: NHannes Eder <hannes@hanneseder.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/usb/hso.c

@@ -1246,7 +1246,7 @@ static void hso_std_serial_read_bulk_callback(struct urb *urb)
  * This needs to be a tasklet otherwise we will
  * end up recursively calling this function.
  */
-void hso_unthrottle_tasklet(struct hso_serial *serial)
+static void hso_unthrottle_tasklet(struct hso_serial *serial)
 {
 	unsigned long flags;
 
@@ -1265,7 +1265,7 @@ static	void hso_unthrottle(struct tty_struct *tty)
 	tasklet_hi_schedule(&serial->unthrottle_tasklet);
 }
 
-void hso_unthrottle_workfunc(struct work_struct *work)
+static void hso_unthrottle_workfunc(struct work_struct *work)
 {
 	struct hso_serial *serial =
 	    container_of(work, struct hso_serial,
@@ -1464,7 +1464,7 @@ static int hso_serial_chars_in_buffer(struct tty_struct *tty)
 
 	return chars;
 }
-int tiocmget_submit_urb(struct hso_serial *serial,
+static int tiocmget_submit_urb(struct hso_serial *serial,
 			       struct hso_tiocmget *tiocmget,
 			       struct usb_device *usb)
 {

drivers/net/usb/smsc95xx.c

@@ -58,7 +58,7 @@ struct usb_context {
 	struct usbnet *dev;
 };
 
-int turbo_mode = true;
+static int turbo_mode = true;
 module_param(turbo_mode, bool, 0644);
 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");