t3508: add check_head_differs_from() helper function and use it

diff --git a/diffcore-break.c b/diffcore-break.c
index 3a7b60a037b2e3c869afe76a23b671cfd5311338..44f8678d22ea466b0867591429bbcc3285cdaf91 100644 (file)
--- a/diffcore-break.c
+++ b/diffcore-break.c
@@ -162,8 +162,7 @@ void diffcore_break(int break_score)
        if (!merge_score)
                merge_score = DEFAULT_MERGE_SCORE;
 
-       outq.nr = outq.alloc = 0;
-       outq.queue = NULL;
+       DIFF_QUEUE_CLEAR(&outq);
 
        for (i = 0; i < q->nr; i++) {
                struct diff_filepair *p = q->queue[i];
@@ -256,8 +255,7 @@ void diffcore_merge_broken(void)
        struct diff_queue_struct outq;
        int i, j;
 
-       outq.nr = outq.alloc = 0;
-       outq.queue = NULL;
+       DIFF_QUEUE_CLEAR(&outq);
 
        for (i = 0; i < q->nr; i++) {
                struct diff_filepair *p = q->queue[i];