staging: comedi: comedi_bond: just check devprivs->devs once on detach

The `while` loop in `bonding_detach()` doesn't need to check
`devpriv->devs` each time round the loop.  Move the test outside the
loop.  The enclosing `if (devpriv)` can be changed to `if (devpriv &&
devpriv->devs)` as everything in this `if` statement is associated with
`devpriv->devs` anyway.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/comedi_bond.c

@@ -339,11 +339,11 @@ static void bonding_detach(struct comedi_device *dev)
 {
 	struct comedi_bond_private *devpriv = dev->private;
 
-	if (devpriv) {
+	if (devpriv && devpriv->devs) {
 		DECLARE_BITMAP(devs_closed, COMEDI_NUM_BOARD_MINORS);
 
 		memset(&devs_closed, 0, sizeof(devs_closed));
-		while (devpriv->ndevs-- && devpriv->devs) {
+		while (devpriv->ndevs--) {
 			struct bonded_device *bdev;
 
 			bdev = devpriv->devs[devpriv->ndevs];