ds1wm: should check for IS_ERR(clk) instead of NULL

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>
Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/w1/masters/ds1wm.c b/drivers/w1/masters/ds1wm.c
index 688e435b4d9a..78a14dacb8ec 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;
         }