bcachefs: Fix extent_to_replicas()

This needs to match bch2_mark_extent()/bch2_trans_mark_extent() in
buckets.c
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/replicas.c

@@ -84,10 +84,10 @@ static void extent_to_replicas(struct bkey_s_c k,
 		if (p.ptr.cached)
 			continue;
 
-		if (p.has_ec)
-			r->nr_required = 0;
-
+		if (!p.has_ec)
 			r->devs[r->nr_devs++] = p.ptr.dev;
+		else
+			r->nr_required = 0;
 	}
 }