staging: comedi: comedi_fc: remove 'extern' from function prototypes

The 'extern' is not needed in the prototypes for the exported functions
in the header. Remove it.
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/comedi_fc.h

@@ -24,9 +24,8 @@
 #include "../comedidev.h"
 
 /* Writes an array of data points to comedi's buffer */
-extern unsigned int cfc_write_array_to_buffer(struct comedi_subdevice *subd,
-					      void *data,
-					      unsigned int num_bytes);
+unsigned int cfc_write_array_to_buffer(struct comedi_subdevice *,
+				       void *data, unsigned int num_bytes);
 
 static inline unsigned int cfc_write_to_buffer(struct comedi_subdevice *subd,
 					       unsigned short data)
@@ -40,12 +39,11 @@ static inline unsigned int cfc_write_long_to_buffer(struct comedi_subdevice
 	return cfc_write_array_to_buffer(subd, &data, sizeof(data));
 };
 
-extern unsigned int cfc_read_array_from_buffer(struct comedi_subdevice *subd,
-					       void *data,
-					       unsigned int num_bytes);
+unsigned int cfc_read_array_from_buffer(struct comedi_subdevice *,
+					void *data, unsigned int num_bytes);
 
-extern unsigned int cfc_handle_events(struct comedi_device *dev,
-				      struct comedi_subdevice *subd);
+unsigned int cfc_handle_events(struct comedi_device *,
+			       struct comedi_subdevice *);
 
 static inline unsigned int cfc_bytes_per_scan(struct comedi_subdevice *subd)
 {