btrfs: Do not reassign count in btrfs_run_delayed_refs

Code cleanup. count is already (unsgined long)-1. That is the reason
run_all was set. Do not reassign it (unsigned long)-1.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent-tree.c

@@ -2972,7 +2972,6 @@ again:
 			spin_unlock(&delayed_refs->lock);
 			goto out;
 		}
-		count = (unsigned long)-1;
 
 		while (node) {
 			head = rb_entry(node, struct btrfs_delayed_ref_head,