utils: pthread_{mutex,cond}_init can fail, so check for it

src/utils.c

@@ -241,6 +241,20 @@ void init_async_pipe(int file_des[2])
 		FATAL("Couldn't set non-blocking I/O: %s\n", strerror(errno));
 }
 
+void xpthread_mutex_init(pthread_mutex_t *m, const pthread_mutexattr_t *a)
+{
+	int err;
+	if ((err = pthread_mutex_init(m, a)))
+		FATAL("failed to init mutex: %s\n", strerror(err));
+}
+
+void xpthread_cond_init(pthread_cond_t *c, pthread_condattr_t *a)
+{
+	int err;
+	if ((err = pthread_cond_init(c, a)))
+		FATAL("failed to init cond: %s\n", strerror(err));
+}
+
 void xpthread_mutex_destroy(pthread_mutex_t *mutex)
 {
 	int err;

src/utils.h

@@ -82,6 +82,10 @@ int set_nonblocking(int fd);
 
 void init_async_pipe(int file_des[2]);
 
+void xpthread_mutex_init(pthread_mutex_t *m, const pthread_mutexattr_t *a);
+
+void xpthread_cond_init(pthread_cond_t *c, pthread_condattr_t *a);
+
 void xpthread_mutex_destroy(pthread_mutex_t *mutex);
 
 void xpthread_cond_destroy(pthread_cond_t *cond);