--summary output should print immediately after stats.

Currently the summary is displayed after the patch.  Fix this so
that the output order is stat-summary-patch.  As a consequence of
the way this is coded, the --summary option will only actually
display summary data if combined with either the --stat or
--patch-with-stat option.

Signed-off-by: Sean Estabrooks <seanlkml@sympatico.ca>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff.c

@@ -1988,6 +1988,9 @@ void diff_flush(struct diff_options *options)
 		show_stats(diffstat);
 		free(diffstat);
 		diffstat = NULL;
+		if (options->summary)
+			for (i = 0; i < q->nr; i++)
+				diff_summary(q->queue[i]);
 		putchar(options->line_termination);
 	}
 	for (i = 0; i < q->nr; i++) {
@@ -2001,7 +2004,7 @@ void diff_flush(struct diff_options *options)
 	}
 
 	for (i = 0; i < q->nr; i++) {
-		if (options->summary)
+		if (diffstat && options->summary)
 			diff_summary(q->queue[i]);
 		diff_free_filepair(q->queue[i]);
 	}