Photo: Arnold Jerocki/Getty Images His recent beef with Drake ended in a resounding victory, he was awarded a coveted performance slot at the Super Bowl halftime show, and, earlier this month, he was nominated for seven Grammys. Yet on his surprise-released LP GNX , Kendrick Lamar seems mad as hell. A closer look at the lyrics offer some clues to his reasoning: People he cares about are dying and getting locked up; others he looked up to are either disappointed by him or disappointing him. Also,