[PATCH] staging: comedi: ni_660x: fix missing break in switch statement

["Gustavo A. R. Silva" <gustavo@embeddedor.com>]

Add missing break statement in order to prevent the code from falling
through to the default case and return -EINVAL every time.

This bug was found thanks to the ongoing efforts to enable
-Wimplicit-fallthrough.

Fixes: 58dd7c0a2a6e ("Staging: comedi: add ni_660x driver")
Cc: stable@vger.kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
 drivers/staging/comedi/drivers/ni_660x.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/comedi/drivers/ni_660x.c b/drivers/staging/comedi/drivers/ni_660x.c
index e70a461e723f..405573e927cf 100644
--- a/drivers/staging/comedi/drivers/ni_660x.c
+++ b/drivers/staging/comedi/drivers/ni_660x.c
@@ -656,6 +656,7 @@ static int ni_660x_set_pfi_routing(struct comedi_device *dev,
 	case NI_660X_PFI_OUTPUT_DIO:
 		if (chan > 31)
 			return -EINVAL;
+		break;
 	default:
 		return -EINVAL;
 	}
-- 
2.20.1