Btrfs: Delete any remaining extent_maps before freeing the inode

Signed-off-by: NChris Mason <chris.mason@oracle.com>

fs/btrfs/inode.c

@@ -2601,6 +2601,7 @@ void btrfs_destroy_inode(struct inode *inode)
 	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));
 }