Use standard tree-diff function when showing diffstat for single commit

Remove unneeded code from ui-commit.c and replace with call to standard
diff-functions.

Also fix some whitespace issues.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

ui-commit.c

@@ -86,41 +86,6 @@ void print_filepair(struct diff_filepair *pair)
 	files++;
 }
 
-void diff_format_cb(struct diff_queue_struct *q,
-		    struct diff_options *options, void *data)
-{
-	int i;
-
-	for (i = 0; i < q->nr; i++) {
-		if (q->queue[i]->status == 'U')
-			continue;
-		print_filepair(q->queue[i]);
-	}
-}
-
-void cgit_diffstat(struct commit *commit)
-{
-	struct diff_options opt;
-	int ret;
-
-	diff_setup(&opt);
-	opt.output_format = DIFF_FORMAT_CALLBACK;
-	opt.detect_rename = 1;
-	opt.recursive = 1;
-	opt.format_callback = diff_format_cb;
-	diff_setup_done(&opt);
-	
-	if (commit->parents)
-		ret = diff_tree_sha1(commit->parents->item->object.sha1,
-				     commit->object.sha1,
-				     "", &opt);
-	else
-		ret = diff_root_tree_sha1(commit->object.sha1, "", &opt);
-
-	diffcore_std(&opt);
-	diff_flush(&opt);
-}
-
 void cgit_print_commit(const char *hex)
 {
 	struct commit *commit;
@@ -176,7 +141,6 @@ void cgit_print_commit(const char *hex)
 				       fmt("id=%s&name=%s", hex, filename)));
 		htmlf("'>%s</a></td></tr>", filename);
 	}
-	
 	html("</table>\n");
 	html("<div class='commit-subject'>");
 	html_txt(info->subject);
@@ -186,7 +150,7 @@ void cgit_print_commit(const char *hex)
 	html("</div>");
 	html("<table class='diffstat'>");
 	html("<tr><th colspan='3'>Affected files</tr>\n");
-	cgit_diffstat(commit);
+	cgit_diff_commit(commit, print_filepair);
 	htmlf("<tr><td colspan='3' class='summary'>"
 	      "%d file%s changed</td></tr>\n", files, files > 1 ? "s" : "");
 	html("</table>");