rev-list: pass "int flags" as last argument of "show_bisect_vars"

Instead of "int show_all, int show_tried" we now only pass "int flags",
because we will add one more flag in a later patch.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

bisect.c

@@ -547,5 +547,5 @@ int bisect_next_vars(const char *prefix)
 	revs.commits = find_bisection(revs.commits, &reaches, &all,
 				      !!skipped_sha1_nr);
 
-	return show_bisect_vars(&revs, reaches, all, 0, 1);
+	return show_bisect_vars(&revs, reaches, all, BISECT_SHOW_TRIED);
 }