We free "node" and then dereference it in the panic message on the next
line.  I considered moving the kfree() after the panic given that panic
can return under certain configurations, but in the end I decided it
doesn't matter if we leak a bit after a panic.

Signed-off-by: Dan Carpenter <redacted>

diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 790f492..c50d80a 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c

@@ -1239,7 +1239,6 @@ static int __must_check __add_reloc_root(struct btrfs_root *root)
  			      node->bytenr, &node->rb_node);
  	spin_unlock(&rc->reloc_root_tree.lock);
  	if (rb_node) {
-		kfree(node);
  		btrfs_panic(root->fs_info, -EEXIST, "Duplicate root found "
  			    "for start=%llu while inserting into relocation "
  			    "tree\n", node->bytenr);