[PATCH] kernfs: checking for IS_ERR() instead of NULL

[Dan Carpenter]

The kernfs_get_inode() returns NULL on error, it never returns error
pointers.

Fixes: aa8188253474 ("kernfs: add exportfs operations")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index 7c452f4d83e9..95a7c88baed9 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -99,8 +99,8 @@ static struct inode *kernfs_fh_get_inode(struct super_block 
*sb,
                return ERR_PTR(-ESTALE);
        inode = kernfs_get_inode(sb, kn);
        kernfs_put(kn);
-       if (IS_ERR(inode))
-               return ERR_CAST(inode);
+       if (!inode)
+               return ERR_PTR(-ESTALE);
 
        if (generation && inode->i_generation != generation) {
                /* we didn't find the right inode.. */