diff.c: use diff_free_queue()

Use diff_free_queue() instead of open-coding it.  This shortens the
code and make it less repetitive.

Note that the second hunk in diff_flush() is interesting, because the
'free_queue' label separates the loop freeing the queue's filepairs
from free()-ing the queue's internal array.  This is somewhat
suspicious, but it was not an issue before: there is only one place
from where we jump to this label with a goto, and that is protected by
an 'if (!q->nr && ...)' condition, i.e. we only skipped the loop
freeing the filepairs when there were no filepairs in the queue to
begin with.

Signed-off-by: SZEDER Gábor <[email protected]>
Signed-off-by: Taylor Blau <[email protected]>

Author: szeder

diff.c

@@ -6337,13 +6337,9 @@ static int diff_get_patch_id(struct diff_options *options, struct object_id *oid
 int diff_flush_patch_id(struct diff_options *options, struct object_id *oid, int diff_header_only)
 {
 	struct diff_queue_struct *q = &diff_queued_diff;
-	int i;
 	int result = diff_get_patch_id(options, oid, diff_header_only);
 
-	for (i = 0; i < q->nr; i++)
-		diff_free_filepair(q->queue[i]);
-
-	free(q->queue);
+	diff_free_queue(q);
 	DIFF_QUEUE_CLEAR(q);
 
 	return result;
@@ -6612,10 +6608,8 @@ void diff_flush(struct diff_options *options)
 	if (output_format & DIFF_FORMAT_CALLBACK)
 		options->format_callback(q, options, options->format_callback_data);
 
-	for (i = 0; i < q->nr; i++)
-		diff_free_filepair(q->queue[i]);
 free_queue:
-	free(q->queue);
+	diff_free_queue(q);
 	DIFF_QUEUE_CLEAR(q);
 	diff_free(options);