Let's say that Hitler never really gets into politics. He becomes a general instead and isn't even slightly nuts unlike OTL. Consequences?
General Hitler is nearly ASB. Given his family background, his chances to become a high officer the A-H monarchy are practically zero. In pre-WWI Bavaria or the rest of Germany, as well, as he was not even a German citizen.
After WWI, the number of German officers was capped by the ToV, and Hitlers chances are zero now, as well.
So nuts or completely sane, forget Germany and Austria, and for obvious reasons the UK and France as well. Hitler becoming a Marxist pre-WWI and somehow ending up as high officer in the Red Army is negated by your PoD.
So the only, very, very slight chance is Hitler emigrating to the US in the 1908 to 1910 period, turning his life around and starting a successful military career during WWI in the USArmy.
But do not forget that a Hitler who does not become interested in politics will simply remain a lying, thieving slacker in Vienna, despising bread-winning jobs and picturing himself as superior artist while defrauding his relatives. Hardly officer material.