staging: comedi: change comedi_alloc_subdevice_minor parameters

`comedi_alloc_subdevice_minor()` doesn't really need a parameter
pointing to a `struct comedi_device` as it can get this information from
the parameter pointing to a `struct comedi_subdevice`.  Just pass the
subdevice parameter.
Signed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/comedi_fops.c

@@ -2352,9 +2352,9 @@ int comedi_find_board_minor(struct device *hardware_device)
 	return -ENODEV;
 }
 
-int comedi_alloc_subdevice_minor(struct comedi_device *dev,
-				 struct comedi_subdevice *s)
+int comedi_alloc_subdevice_minor(struct comedi_subdevice *s)
 {
+	struct comedi_device *dev = s->device;
 	struct comedi_file_info *info;
 	struct device *csdev;
 	unsigned i;

drivers/staging/comedi/comedi_internal.h

@@ -11,8 +11,7 @@ int do_rangeinfo_ioctl(struct comedi_device *dev,
 int comedi_alloc_board_minor(struct device *hardware_device);
 void comedi_free_board_minor(unsigned minor);
 int comedi_find_board_minor(struct device *hardware_device);
-int comedi_alloc_subdevice_minor(struct comedi_device *dev,
-				 struct comedi_subdevice *s);
+int comedi_alloc_subdevice_minor(struct comedi_subdevice *s);
 void comedi_free_subdevice_minor(struct comedi_subdevice *s);
 
 int comedi_buf_alloc(struct comedi_device *dev, struct comedi_subdevice *s,

drivers/staging/comedi/drivers.c

@@ -209,7 +209,7 @@ static int __comedi_device_postconfig_async(struct comedi_device *dev,
 			return ret;
 	}
 
-	comedi_alloc_subdevice_minor(dev, s);
+	comedi_alloc_subdevice_minor(s);
 
 	return 0;
 }