Revert "fuse: fix UAF in rcu pathwalks"

This reverts commit bfbab62c which is
commit 053fc4f7 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I11762cacffd411044eaf3b771d3646c4300c52cf
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>