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>

fs/fuse/fuse_i.h

@@ -402,6 +402,9 @@ struct fuse_iqueue {
 };
 
 struct fuse_pqueue {
+	/** Connection established */
+	unsigned connected;
+
 	/** The list of requests being processed */
 	struct list_head processing;