Don't use memset on a char pointer
Based on JACoders/OpenJK@ade3c4238dd51dcf056ab1132b1c4dddc046ef02
Fix a gram of Waddress GCC warnings
Fix a metre of warnings in game/ai_main.c
Based on JACoders/OpenJK@24896e57ae28bdea43d3e361c1b7f726313c38c5
Fix hours of GCC warnings