Staging: comedi: comedi_rt_task_context_t fix

Fix redefinition of macro comedi_rt_task_context_t

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

drivers/staging/comedi/drivers/comedi_rt_timer.c

@@ -104,8 +104,6 @@ static inline RTIME nano2count(long long ns)
 #define start_rt_timer(x)
 #define stop_rt_timer()
 
-#define comedi_rt_task_context_t	int
-
 #endif
 #ifdef CONFIG_COMEDI_RTAI
 #include <rtai.h>