STM32CubeWL: fix printf format warnings

These warnings are caused because frequencies are stored as `uint32_t`,
which is `unsigned long`, while the printf format expects `int`. In
practice, this does not actually cause problems, since on STM32 gcc
`long` and `int` are both 32-bits and frequencies are never large enough
to cause signed vs unsigned ambiguity.

Since printf has no format specifiers for e.g. uint32_t (libc does have
some macros for this, but those really hurt readability), this is tricky
to fix in a portable way (other architectures or compilers might have
`uint32_t` equal to `unsigned int` instead of `unsigned long`), this fix
just casts the frequency to `unsigned` before passing it to printf (and
for good measure, also convert the specifier from `%d` to `%u`). This
does mean this printing will break if `int` is not at least 32-bits
(e.g. on AVR), but given the scope of this library, that should be
acceptable.

Author: matthijskooijman

src/STM32CubeWL/LoRaWAN/Mac/Region/RegionCommon.c

@@ -659,7 +659,7 @@ void RegionCommonRxBeaconSetup( RegionCommonRxBeaconSetupParams_t* rxBeaconSetup
                        1, 0, 10, rxBeaconSetupParams->SymbolTimeout, true, rxBeaconSetupParams->BeaconSize, false, 0, 0, false, rxContinuous );
 
     Radio.Rx( rxBeaconSetupParams->RxTime );
-    MW_LOG(TS_ON, VLEVEL_M, "RX_BC on freq %d Hz at DR %d\r\n", rxBeaconSetupParams->Frequency, rxBeaconSetupParams->BeaconDatarate );
+    MW_LOG(TS_ON, VLEVEL_M, "RX_BC on freq %u Hz at DR %d\r\n", (unsigned)rxBeaconSetupParams->Frequency, rxBeaconSetupParams->BeaconDatarate );
 }
 
 void RegionCommonCountNbOfEnabledChannels( RegionCommonCountNbOfEnabledChannelsParams_t* countNbOfEnabledChannelsParams,
@@ -793,17 +793,17 @@ void RegionCommonRxConfigPrint(LoRaMacRxSlot_t rxSlot, uint32_t frequency, int8_
 {
     if ( rxSlot < RX_SLOT_NONE )
     {
-        MW_LOG(TS_ON, VLEVEL_M,  "RX_%s on freq %d Hz at DR %d\r\n", EventRXSlotStrings[rxSlot], frequency, dr );
+        MW_LOG(TS_ON, VLEVEL_M,  "RX_%s on freq %u Hz at DR %d\r\n", EventRXSlotStrings[rxSlot], (unsigned)frequency, dr );
     }
     else
     {
-        MW_LOG(TS_ON, VLEVEL_M,  "RX on freq %d Hz at DR %d\r\n", frequency, dr );
+        MW_LOG(TS_ON, VLEVEL_M,  "RX on freq %u Hz at DR %d\r\n", (unsigned)frequency, dr );
     }
 }
 
 void RegionCommonTxConfigPrint(uint32_t frequency, int8_t dr)
 {
-    MW_LOG(TS_ON, VLEVEL_M,  "TX on freq %d Hz at DR %d\r\n", frequency, dr );
+    MW_LOG(TS_ON, VLEVEL_M,  "TX on freq %u Hz at DR %d\r\n", (unsigned)frequency, dr );
 }
 
 #pragma GCC diagnostic pop