staging: mt7621-pinctrl: use ternary operator return in rt2880_get_group_name

Trivial change to have only one return in 'rt2880_get_group_name'
function using a ternary operator instead of an if statement and
two returns.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c

@@ -54,10 +54,7 @@ static const char *rt2880_get_group_name(struct pinctrl_dev *pctrldev,
 {
 	struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
 
-	if (group >= p->group_count)
-		return NULL;
-
-	return p->group_names[group];
+	return (group >= p->group_count) ? NULL : p->group_names[group];
 }
 
 static int rt2880_get_group_pins(struct pinctrl_dev *pctrldev,