staging: comedi: drivers: Remove unnecessary else following return

Else is unnecessary when there is a return statement in the
corresponding if block.
Coccinelle patch:

@rule1@
expression e1;
@@

	if (e1) { ... return ...; }
-       else{
	        ...
-            }

@rule2@
expression e2;
statement s1;
@@

	if(e2) { ... return ...; }
-       else
		s1
Signed-off-by: Janani Ravichandran <janani.rvchndrn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/comedi_isadma.c

@@ -132,8 +132,7 @@ unsigned int comedi_isadma_poll(struct comedi_isadma *dma)
 		result = result1;
 	if (result >= desc->size || result == 0)
 		return 0;
-	else
-		return desc->size - result;
+	return desc->size - result;
 }
 EXPORT_SYMBOL_GPL(comedi_isadma_poll);