MIPS: Modify error handling

Author: Amitoj Kaur Chawla <amitoj1606@gmail.com>

debugfs_create_file returns NULL on error so an IS_ERR test is
incorrect here and a NULL check is required.

The Coccinelle semantic patch used to make this change is as follows:
@@
expression e;
@@

  e = debugfs_create_file(...);
if(
-    IS_ERR(e)
+    !e
    )
    {
  <+...
  return
- PTR_ERR(e)
+ -ENOMEM
  ;
  ...+>
  }

Signed-off-by: Amitoj Kaur Chawla 
Cc: julia.lawall@lip6.fr
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/13834/
Signed-off-by: Ralf Baechle 

---
 arch/mips/mm/sc-debugfs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
 
diff --git a/arch/mips/mm/sc-debugfs.c b/arch/mips/mm/sc-debugfs.c
index 5eefe32..01f1154 100644
--- a/arch/mips/mm/sc-debugfs.c
+++ b/arch/mips/mm/sc-debugfs.c
@@ -73,8 +73,8 @@ static int __init sc_debugfs_init(void)
 
 	file = debugfs_create_file("prefetch", S_IRUGO | S_IWUSR, dir,
 				   NULL, &sc_prefetch_fops);
-	if (IS_ERR(file))
-		return PTR_ERR(file);
+	if (!file)
+		return -ENOMEM;
 
 	return 0;
 }