Staging: comedi: make comedi_reset_async_buf local to comedi core

No one outside of the comedi core calls this function, so don't export
it to the world.

Cc: Ian Abbott <[e-mail]>
Cc: Frank Mori Hess <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/comedi/comedidev.h

···
 	return async->buf_read_alloc_count - async->buf_read_count;
 }
 
-void comedi_reset_async_buf(struct comedi_async *async);
-
 static inline void *comedi_aux_data(int options[], int n)
 {
 	unsigned long address;

drivers/staging/comedi/drivers.c

···
 
 	async->events = 0;
 }
-EXPORT_SYMBOL(comedi_reset_async_buf);
 
 int comedi_auto_config(struct device *hardware_device, const char *board_name,
 		       const int *options, unsigned num_options)

drivers/staging/comedi/internal.h

···
 
 int comedi_alloc_board_minor(struct device *hardware_device);
 void comedi_free_board_minor(unsigned minor);
+void comedi_reset_async_buf(struct comedi_async *async);