fixes bug in routine yac_interpolation_sum_mvp_at_tgt_copy

src/interpolation_sum_mvp_at_tgt.c

@@ -403,7 +403,7 @@ static struct interpolation_type * yac_interpolation_sum_mvp_at_tgt_copy(
         sum_mvp_at_tgt->src_send_data, sum_mvp_at_tgt->num_src_fields,
         sum_mvp_at_tgt->collection_size),
       yac_interpolation_buffer_copy(
-        sum_mvp_at_tgt->src_send_data, sum_mvp_at_tgt->num_src_fields,
+        sum_mvp_at_tgt->src_recv_data, sum_mvp_at_tgt->num_src_fields,
         sum_mvp_at_tgt->collection_size),
       yac_interpolation_exchange_copy(sum_mvp_at_tgt->src2tgt),
       sum_mvp_at_tgt->tgt_pos,  sum_mvp_at_tgt->tgt_count,