Issue #849 - Update the function RegionCommonIdentifyChannels to make sure that it assigns a zero. Make sure that the function is save.

Author: Daniel Jaeckle

src/mac/LoRaMac.c

@@ -3396,6 +3396,11 @@ LoRaMacStatus_t LoRaMacQueryNextTxDelay( int8_t datarate, TimerTime_t* time )
     uint32_t adrAckCounter = MacCtx.NvmCtx->AdrAckCounter;
     int8_t txPower = MacCtx.NvmCtx->MacParamsDefaults.ChannelsTxPower;
 
+    if( time == NULL )
+    {
+        return LORAMAC_STATUS_PARAMETER_INVALID;
+    }
+
     if( MacCtx.NvmCtx->LastTxDoneTime == 0 )
     {
         *time = 0;

src/mac/region/RegionCommon.c

@@ -457,6 +457,7 @@ LoRaMacStatus_t RegionCommonIdentifyChannels( RegionCommonIdentifyChannelsParam_
 
     if( *nbEnabledChannels > 0 )
     {
+        *nextTxDelay = 0;
         return LORAMAC_STATUS_OK;
     }
     else if( *nbRestrictedChannels > 0 )