staging: comedi: ni_tio.h: remove 'extern' from exported function prototypes

The 'extern' is not required, remove it.

Tidy up the function prototypes a bit.
Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: NIan Abbott <abbotti@mev.co.uk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/ni_tio.h

@@ -126,40 +126,29 @@ struct ni_gpct_device {
 	spinlock_t regs_lock;
 };
 
-extern struct ni_gpct_device *ni_gpct_device_construct(struct comedi_device
-						       *dev,
-						       void (*write_register)
-						       (struct ni_gpct *
-							counter, unsigned bits,
-							enum ni_gpct_register
-							reg),
-						       unsigned (*read_register)
-						       (struct ni_gpct *
-							counter,
-							enum ni_gpct_register
-							reg),
-						       enum ni_gpct_variant
-						       variant,
-						       unsigned num_counters);
-extern void ni_gpct_device_destroy(struct ni_gpct_device *counter_dev);
-extern void ni_tio_init_counter(struct ni_gpct *counter);
-extern int ni_tio_rinsn(struct ni_gpct *counter,
-			struct comedi_insn *insn, unsigned int *data);
-extern int ni_tio_insn_config(struct ni_gpct *counter,
-			      struct comedi_insn *insn, unsigned int *data);
-extern int ni_tio_winsn(struct ni_gpct *counter,
-			struct comedi_insn *insn, unsigned int *data);
-extern int ni_tio_cmd(struct ni_gpct *counter, struct comedi_async *async);
-extern int ni_tio_cmdtest(struct ni_gpct *counter, struct comedi_cmd *cmd);
-extern int ni_tio_cancel(struct ni_gpct *counter);
-extern void ni_tio_handle_interrupt(struct ni_gpct *counter,
-				    struct comedi_subdevice *s);
-extern void ni_tio_set_mite_channel(struct ni_gpct *counter,
-				    struct mite_channel *mite_chan);
-extern void ni_tio_acknowledge_and_confirm(struct ni_gpct *counter,
-					   int *gate_error, int *tc_error,
-					   int *perm_stale_data,
-					   int *stale_data);
+struct ni_gpct_device *
+ni_gpct_device_construct(struct comedi_device *,
+			 void (*write_register)(struct ni_gpct *,
+						unsigned bits,
+						enum ni_gpct_register),
+			 unsigned (*read_register)(struct ni_gpct *,
+						   enum ni_gpct_register),
+			 enum ni_gpct_variant,
+			 unsigned num_counters);
+void ni_gpct_device_destroy(struct ni_gpct_device *);
+void ni_tio_init_counter(struct ni_gpct *);
+int ni_tio_rinsn(struct ni_gpct *, struct comedi_insn *, unsigned int *data);
+int ni_tio_insn_config(struct ni_gpct *, struct comedi_insn *,
+		       unsigned int *data);
+int ni_tio_winsn(struct ni_gpct *, struct comedi_insn *, unsigned int *data);
+int ni_tio_cmd(struct ni_gpct *, struct comedi_async *);
+int ni_tio_cmdtest(struct ni_gpct *, struct comedi_cmd *);
+int ni_tio_cancel(struct ni_gpct *);
+void ni_tio_handle_interrupt(struct ni_gpct *, struct comedi_subdevice *);
+void ni_tio_set_mite_channel(struct ni_gpct *, struct mite_channel *);
+void ni_tio_acknowledge_and_confirm(struct ni_gpct *,
+				    int *gate_error, int *tc_error,
+				    int *perm_stale_data, int *stale_data);
 
 static inline struct ni_gpct *subdev_to_counter(struct comedi_subdevice *s)
 {