Btrfs: don't break in the final loop of find_extent_clone

If we break, we may miss the clone from send_root which we prefer
over all other clones.

Commit is a result of Arne's review.

Reported-by: Arne Jansen <sensille@gmx.net>
Signed-off-by: Alexander Block <ablock84@googlemail.com>
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index d2a4ee9..68b2543 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -1257,7 +1257,6 @@
 			else if (sctx->clone_roots[i].root == sctx->send_root)
 				/* prefer clones from send_root over others */
 				cur_clone_root = sctx->clone_roots + i;
-			break;
 		}
 
 	}