minor condition change

there's no guarantee that the function will return 1 on success, at least not in the documentation

base/mutex.h

@@ -96,7 +96,7 @@ public:
 
 	bool trylock() {
 #ifdef _WIN32
-		return TryEnterCriticalSection(&mut_) == TRUE;
+		return TryEnterCriticalSection(&mut_) != FALSE;
 #else
 		return pthread_mutex_trylock(&mut_) != EBUSY;
 #endif