Staging: comedi: mark a variable as __user

This is really a userspace pointer, so mark it as such.

Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/comedi/comedi.h

@@ -354,7 +354,7 @@
 		unsigned int __user *chanlist;	/* channel/range list */
 		unsigned int chanlist_len;
 
-		short *data;	/* data list, size depends on subd flags */
+		short __user *data;	/* data list, size depends on subd flags */
 		unsigned int data_len;
 	};