ext4: fix up rb_root initializations to use RB_ROOT

ext4 uses rb_node = NULL; to zero rb_root at few places.  Using
RB_ROOT as the initializer is more portable in case the underlying
implementation of rbtrees changes in the future.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Eric Paris <eparis@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index 29857ddd9e26..86cb6d86a048 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -305,7 +305,7 @@ static void free_rb_tree_fname(struct rb_root *root)
                         kfree(old);
                 }
                 if (!parent)
-                        root->rb_node = NULL;
+                        *root = RB_ROOT;
                 else if (parent->rb_left == n)
                         parent->rb_left = NULL;
                 else if (parent->rb_right == n)