ext4: use IS_ERR() to check for errors in ext4_error_file
d_path() returns an ERR_PTR and it doesn't return NULL. This is in
ext4_error_file() and no one actually calls ext4_error_file().
Signed-off-by: Dan Carpenter <error27@gmail.com>
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index c228da1..d49e3b1 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -437,7 +437,7 @@
save_error_info(inode->i_sb, function, line);
va_start(args, fmt);
path = d_path(&(file->f_path), pathname, sizeof(pathname));
- if (!path)
+ if (IS_ERR(path))
path = "(unknown)";
printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: inode #%lu "