git diff --no-index: default to page like other diff frontends

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff-no-index.c

@@ -198,6 +198,13 @@ void diff_no_index(struct rev_info *revs,
 		die("git diff %s takes two paths",
 		    no_index ? "--no-index" : "[--no-index]");
 
+	/*
+	 * If the user asked for our exit code then don't start a
+	 * pager or we would end up reporting its exit code instead.
+	 */
+	if (!DIFF_OPT_TST(&revs->diffopt, EXIT_WITH_STATUS))
+		setup_pager();
+
 	diff_setup(&revs->diffopt);
 	if (!revs->diffopt.output_format)
 		revs->diffopt.output_format = DIFF_FORMAT_PATCH;