🎨 NULL => nullptr

Marlin/src/HAL/STM32/Sd2Card_sdio_stm32duino.cpp

@@ -290,13 +290,13 @@ static bool SDIO_ReadWriteBlock_DMA(uint32_t block, const uint8_t *src, uint8_t
 
 bool SDIO_ReadBlock(uint32_t block, uint8_t *dst) {
   uint8_t retries = SDIO_READ_RETRIES;
-  while (retries--) if (SDIO_ReadWriteBlock_DMA(block, NULL, dst)) return true;
+  while (retries--) if (SDIO_ReadWriteBlock_DMA(block, nullptr, dst)) return true;
   return false;
 }
 
 bool SDIO_WriteBlock(uint32_t block, const uint8_t *src) {
   uint8_t retries = SDIO_READ_RETRIES;
-  while (retries--) if (SDIO_ReadWriteBlock_DMA(block, src, NULL)) return true;
+  while (retries--) if (SDIO_ReadWriteBlock_DMA(block, src, nullptr)) return true;
   return false;
 }
 

Marlin/src/HAL/STM32F1/SPI.h

@@ -138,8 +138,8 @@ private:
   spi_dev *spi_d;
   dma_channel spiRxDmaChannel, spiTxDmaChannel;
   dma_dev* spiDmaDev;
-  void (*receiveCallback)() = NULL;
-  void (*transmitCallback)() = NULL;
+  void (*receiveCallback)() = nullptr;
+  void (*transmitCallback)() = nullptr;
 
   friend class SPIClass;
 };