modify lte-enb.c double pthread_mutex_lock

targets/RT/USER/lte-enb.c

@@ -553,13 +553,10 @@ int wakeup_txfh(PHY_VARS_eNB *eNB, L1_rxtx_proc_t *proc,int frame_tx,int subfram
   if (waitret == ETIMEDOUT) {
      LOG_W(PHY,"Dropping TX slot (%d.%d) because FH is blocked more than 1 subframe times (1ms)\n",frame_tx,subframe_tx);
 
-     if ((ret=pthread_mutex_lock(&eNB->proc.mutex_RU_tx))!=0) {
      if ((ret=pthread_mutex_lock(&eNB->proc.mutex_RU_tx))!=0) {
        LOG_E(PHY,"mutex_lock returns %d\n",ret);
        return -1;
      }
-       return -1;
-     }
      eNB->proc.RU_mask_tx = 0;
      if ((ret=pthread_mutex_unlock(&eNB->proc.mutex_RU_tx))!=0) {
        LOG_E(PHY,"mutex_unlock returns %d\n",ret);