drivers/staging/comedi/comedi_fops.c: add missing vfree

aux_free is freed on all other exits from the function.  By removing the
return, we can benefit from the vfree already at the end of the function.
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/comedi_fops.c

@@ -301,7 +301,7 @@ static int do_devconfig_ioctl(struct comedi_device *dev,
 	if (ret == 0) {
 		if (!try_module_get(dev->driver->module)) {
 			comedi_device_detach(dev);
-			return -ENOSYS;
+			ret = -ENOSYS;
 		}
 	}