What is the ruling in the Maliki school on limiting the recitation of "Allahu Akbar" (God is Greatest) to two times in the Adhan (call to prayer), and on saying "As-salatu wa as-salamu 'alayka ya Sayyidi ya Rasulallah" (Peace and blessings be upon you, my master, O Messenger of Allah) after the Adhan?

Doubling the takbir in the adhan (definition) is an established Sunnah (definition), based on the hadith (definition) of Abu Mahdhurah, which Malik adopted. Sending blessings and peace upon the Messenger of Allah after the adhan is originally prescribed, and the Sunnah is to perform them in obedience to His command, but not in the specific and well-known manner observed in some countries.