[AppArmor 29/45] Fix __d_path() for lazy unmounts and make it unambiguous

First, when __d_path() hits a lazily unmounted mount point, it tries to prepend the name of the lazily unmounted dentry to the path name. It gets this wrong, and also overwrites the slash that separates the name from the following pathname component. This patch fixes that; if a process was in

[AppArmor 29/45] Fix __d_path() for lazy unmounts and make it unambiguous

First, when __d_path() hits a lazily unmounted mount point, it tries to prepend the name of the lazily unmounted dentry to the path name. It gets this wrong, and also overwrites the slash that separates the name from the following pathname component. This patch fixes that; if a process was in