[PATCH 1/2] [W1] ds1wm: should check for IS_ERR(clk) instead of NULL

[Anton Vorontsov <cbouatmailru@gmail.com>]

On the error condition clk_get() returns ERR_PTR(..), so checking
for NULL doesn't work. ds1wm module causes a kernel oops when ds1wm
clock isn't registered.

This patch converts NULL check to IS_ERR(), plus uses PTR_ERR()
for the return code.

Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
---
 drivers/w1/masters/ds1wm.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/w1/masters/ds1wm.c b/drivers/w1/masters/ds1wm.c
index 688e435..78a14da 100644
--- a/drivers/w1/masters/ds1wm.c
+++ b/drivers/w1/masters/ds1wm.c
@@ -17,6 +17,7 @@
 #include <linux/pm.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
+#include <linux/err.h>
 #include <linux/delay.h>
 #include <linux/ds1wm.h>
 
@@ -374,8 +375,8 @@ static int ds1wm_probe(struct platform_device *pdev)
 		goto err1;
 
 	ds1wm_data->clk = clk_get(&pdev->dev, "ds1wm");
-	if (!ds1wm_data->clk) {
-		ret = -ENOENT;
+	if (IS_ERR(ds1wm_data->clk)) {
+		ret = PTR_ERR(ds1wm_data->clk);
 		goto err2;
 	}
 
-- 
1.5.4.3