usb: chipdea: core: fix return -EINVAL if request role is the same with current role

It should not return -EINVAL if the request role is the same with current
role, return non-error and without do anything instead.

Fixes: a932a80 ("usb: chipidea: core: add sysfs group")
cc: <stable@vger.kernel.org>
Acked-by: Peter Chen <peter.chen@kernel.org>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20230317061516.2451728-1-xu.yang_2@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Xu Yang

drivers/usb/chipidea/core.c

@@ -984,9 +984,12 @@ static ssize_t role_store(struct device *dev,
 			     strlen(ci->roles[role]->name)))
 			break;
 
-	if (role == CI_ROLE_END || role == ci->role)
+	if (role == CI_ROLE_END)
 		return -EINVAL;
 
+	if (role == ci->role)
+		return n;
+
 	pm_runtime_get_sync(dev);
 	disable_irq(ci->irq);
 	ci_role_stop(ci);