[PATCH] i2c-s3c2410: Fix potential NULL pointer dereference

[Sachin Kamat <sachin.kamat-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>]

of_match_node() returns NULL if a device_node does not have
a matching of_match structure. Thus the return value needs to be
checked for NULL to avoid NULL pointer dereferencing.

Cc: Wolfram Sang <w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
Cc: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
Cc: Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>
Signed-off-by: Sachin Kamat <sachin.kamat-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
---
 drivers/i2c/busses/i2c-s3c2410.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 5ae3b02..d906523 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -123,6 +123,8 @@ static inline unsigned int s3c24xx_get_device_quirks(struct platform_device *pde
 	if (pdev->dev.of_node) {
 		const struct of_device_id *match;
 		match = of_match_node(s3c24xx_i2c_match, pdev->dev.of_node);
+		if (!match)
+			return 0;
 		return (unsigned int)match->data;
 	}
 
-- 
1.7.4.1