[PATCH 1/1] of: add NULL parameter check for of_device_is_available

[Dong Aisheng]

From: Dong Aisheng <dong.aisheng at linaro.org>

This function will return 1 even the device node passed in
is NULL which is a little error-prone.
Change to return 0 if the device node passed in is NULL.

Signed-off-by: Dong Aisheng <dong.aisheng at linaro.org>
---
 drivers/of/base.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 133908a..b9347d8 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -280,6 +280,9 @@ int of_device_is_available(const struct device_node *device)
 	const char *status;
 	int statlen;
 
+	if (device == NULL)
+		return 0;
+
 	status = of_get_property(device, "status", &statlen);
 	if (status == NULL)
 		return 1;
-- 
1.7.0.4