dbus1-generator: fix array sentinal

Add a {} sentinal entry so the config-iterator can properly iterate all
array elements. Fixes a segfault in the dbus1-generator.

(cherry picked from commit 34a317e1cc)

src/dbus1-generator/dbus1-generator.c

@@ -165,6 +165,7 @@ static int add_dbus(const char *path, const char *fname, const char *type) {
                 { "D-BUS Service", "Exec", config_parse_string, 0, &exec },
                 { "D-BUS Service", "User", config_parse_string, 0, &user },
                 { "D-BUS Service", "SystemdService", config_parse_string, 0, &service },
+                { },
         };
 
         char *p;