Kernel: Fix mutex try_lock return value

WHY IS GCC NOT COMPLAINING FROM HEADERS... I used almost 2 hours
trying to locate why AML was broken

kernel/include/kernel/Lock/Mutex.h

@@ -43,6 +43,7 @@ namespace Kernel
 				ASSERT(m_lock_depth == 0);
 			}
 			m_lock_depth++;
+			return true;
 		}
 
 		void unlock()