fuse: release pipe buf after last use

fuse: release pipe buf after last use

Origin: https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git/commit/?h=for-next&id=473441720c8616dfaf4451f9c7ea14f0eb5e5d65
Bug-Debian: https://bugs.debian.org/1000504

Checking buf->flags should be done before the pipe_buf_release() is called
on the pipe buffer, since releasing the buffer might modify the flags.

This is exactly what page_cache_pipe_buf_release() does, and which results
in the same VM_BUG_ON_PAGE(PageLRU(page)) that the original patch was
trying to fix.

Reported-by: Justin Forbes <jmforbes@linuxtx.org>
Fixes: 712a951025c0 ("fuse: fix page stealing")
Cc: <stable@vger.kernel.org> # v2.6.35
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Gbp-Pq: Topic bugfix/all
Gbp-Pq: Name fuse-release-pipe-buf-after-last-use.patch