[PATCH v2] Fix debugfs_create_file's error checking method for arm/mach-ns9xxx

[Zhaolei <zhaolei@cn.fujitsu.com>]

debugfs_create_file() returns NULL if an error occurs, returns -ENODEV
when debugfs is not enabled in the kernel.

Comparing to PATCH v1, because clk_debugfs_init is included in
"#if defined CONFIG_DEBUG_FS", we only need to check NULL return.
Thanks Li Zefan <lizf@cn.fujitsu.com>

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
---
 arch/arm/mach-ns9xxx/clock.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-ns9xxx/clock.c b/arch/arm/mach-ns9xxx/clock.c
index 44ed20d..f2dba83 100644
--- a/arch/arm/mach-ns9xxx/clock.c
+++ b/arch/arm/mach-ns9xxx/clock.c
@@ -208,7 +208,9 @@ static int __init clk_debugfs_init(void)
 
 	dentry = debugfs_create_file("clk", S_IFREG | S_IRUGO, NULL, NULL,
 			&clk_debugfs_operations);
-	return IS_ERR(dentry) ? PTR_ERR(dentry) : 0;
+	if (!dentry)
+		return -ENOMEM;
+	return 0;
 }
 subsys_initcall(clk_debugfs_init);
 
-- 
1.5.5.3