Revert "gpio: mxc: Unlock on error path in mxc_flip_edge()"

This reverts commit 621f296f11 which is
commit 37870358616ca7fdb1e90ad1cdd791655ec54414 upstream.

It needs to be reverted, as a later commit breaks the ABI and that is
not needed in the Android kernel tree.

Bug: 161946584
Change-Id: Ibec377e5d83f554f1dce645b8b43197acbd4036a
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/gpio/gpio-mxc.c

@@ -236,11 +236,10 @@ static void mxc_flip_edge(struct mxc_gpio_port *port, u32 gpio)
 	} else {
 		pr_err("mxc: invalid configuration for GPIO %d: %x\n",
 		       gpio, edge);
-		goto unlock;
+		return;
 	}
 	writel(val | (edge << (bit << 1)), reg);
 
-unlock:
 	raw_spin_unlock_irqrestore(&port->gc.bgpio_lock, flags);
 }