gpio: wm831x: add a missing break in wm831x_gpio_dbg_show

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/gpio/wm831x-gpio.c b/drivers/gpio/wm831x-gpio.c
index 309644c..2bcfb0b 100644
--- a/drivers/gpio/wm831x-gpio.c
+++ b/drivers/gpio/wm831x-gpio.c
@@ -180,6 +180,7 @@
 			break;
 		case WM831X_GPIO_PULL_UP:
 			pull = "pullup";
+			break;
 		default:
 			pull = "INVALID PULL";
 			break;