[librpthreads] MutexPosix: Remove m_isInit.

pthread_mutex_init() always returns 0.

Also, we weren't handling errors properly anyway, so this didn't
really make a difference.

src/librpthreads/MutexPosix.cpp

@@ -49,22 +49,14 @@ class Mutex
 
 private:
 	pthread_mutex_t m_mutex;
-	bool m_isInit;
 };
 
 /**
  * Create a mutex.
  */
 inline Mutex::Mutex()
-	: m_isInit(false)
 {
-	int ret = pthread_mutex_init(&m_mutex, nullptr);
-	assert(ret == 0);
-	if (ret == 0) {
-		m_isInit = true;
-	} else {
-		// FIXME: Do something if an error occurred here...
-	}
+	pthread_mutex_init(&m_mutex, nullptr);
 }
 
 /**
@@ -73,10 +65,7 @@ inline Mutex::Mutex()
  */
 inline Mutex::~Mutex()
 {
-	if (m_isInit) {
-		// TODO: Error checking.
-		pthread_mutex_destroy(&m_mutex);
-	}
+	pthread_mutex_destroy(&m_mutex);
 }
 
 /**
@@ -87,9 +76,6 @@ inline Mutex::~Mutex()
  */
 inline int Mutex::lock(void)
 {
-	if (!m_isInit)
-		return -EBADF;
-
 	// TODO: What error to return?
 	return pthread_mutex_lock(&m_mutex);
 }
@@ -100,9 +86,6 @@ inline int Mutex::lock(void)
  */
 inline int Mutex::unlock(void)
 {
-	if (!m_isInit)
-		return -EBADF;
-
 	// TODO: What error to return?
 	return pthread_mutex_unlock(&m_mutex);
 }