Btrfs: init old_generation in get_old_root

gcc was giving an uninit variable warning here.  Strictly
speaking we don't need to init it, but this will make things
much less error prone.

Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 04b06bcf2ca9..15cbc2bf4ff0 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1175,7 +1175,7 @@ get_old_root(struct btrfs_root *root, u64 time_seq)
         struct tree_mod_elem *tm;
         struct extent_buffer *eb;
         struct tree_mod_root *old_root = NULL;
-        u64 old_generation;
+        u64 old_generation = 0;
         u64 logical;
 
         eb = btrfs_read_lock_root_node(root);