[PATCH] keyboard: (samsung) fix a missing check of return value

[Kangjie Lu]

of_device_is_compatible() returns false if the device is incompatible.
The fix adds a check for its return value;

Signed-off-by: Kangjie Lu <k...@umn.edu>
---
 drivers/input/keyboard/samsung-keypad.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/input/keyboard/samsung-keypad.c 
b/drivers/input/keyboard/samsung-keypad.c
index 1fe1aa2adf85..5ba940f3f76e 100644
--- a/drivers/input/keyboard/samsung-keypad.c
+++ b/drivers/input/keyboard/samsung-keypad.c
@@ -387,9 +387,13 @@ static int samsung_keypad_probe(struct platform_device 
*pdev)
        keypad->stopped = true;
        init_waitqueue_head(&keypad->wait);
 
-       if (pdev->dev.of_node)
-               keypad->type = of_device_is_compatible(pdev->dev.of_node,
-                                       "samsung,s5pv210-keypad");
+       if (pdev->dev.of_node) {
+               error = of_device_is_compatible(pdev->dev.of_node,
+                               "samsung,s5pv210-keypad");
+               if (!error)
+                       return -EINVAL;
+               keypad->type = error;
+       }
        else
                keypad->type = platform_get_device_id(pdev)->driver_data;
 
-- 
2.17.2 (Apple Git-113)