staging: comedi: 8253.h: checkpatch.pl cleanup (void function return)

Fix the checkpatch.pl warning in this file:

WARNING: void function return statements are not generally useful
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/8253.h

@@ -118,7 +118,6 @@ static inline void i8253_cascade_ns_to_timer(int i8253_osc_base,
 	/*  masking is done since counter maps zero to 0x10000 */
 	*d1 = div1 & 0xffff;
 	*d2 = div2 & 0xffff;
-	return;
 }
 
 #ifndef CMDTEST