fuse: duplicate ->connected in pqueue

This will allow checking ->connected just with the processing queue lock.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Reviewed-by: Ashish Samant <ashish.samant@oracle.com>

diff --cc fs/fuse/dev.c
Simple merge

diff --cc fs/fuse/fuse_i.h
Simple merge

diff --cc fs/fuse/inode.c
Simple merge