Btrfs: Delete any remaining extent_maps before freeing the inode

Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index fd0e0d8..5260b47 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2601,6 +2601,7 @@
 	WARN_ON(!list_empty(&inode->i_dentry));
 	WARN_ON(inode->i_data.nrpages);
 
+	btrfs_drop_extent_cache(inode, 0, (u64)-1);
 	kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
 }