HAL_Linux: fixed timer scheduler

libraries/AP_HAL_Linux/I2CDriver.cpp

@@ -104,9 +104,6 @@ uint8_t LinuxI2CDriver::read(uint8_t addr, uint8_t len, uint8_t* data)
     if (!set_address(addr)) {
         return 1;
     }
-    if (write(addr, 0, NULL) != 0) {
-        return 1;
-    }
     if (::read(_fd, data, len) != len) {
         return 1;
     }

libraries/AP_HAL_Linux/Scheduler.cpp

@@ -27,6 +27,7 @@ void LinuxScheduler::init(void* machtnichts)
     struct sched_param param;
 
     param.sched_priority = APM_LINUX_TIMER_PRIORITY;
+    pthread_attr_init(&thread_attr);
     (void)pthread_attr_setschedparam(&thread_attr, &param);
     pthread_attr_setschedpolicy(&thread_attr, SCHED_FIFO);