Make sure CRC value is pre-zeroed before reading from the XMEGA target device,...

Make sure CRC value is pre-zeroed before reading from the XMEGA target device, to prevent corrupt data from being returned to the host in the AVRISP-MKII Clone project.

Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c

@@ -174,6 +174,8 @@ void XMEGANVM_DisablePDI(void)
  */
 bool XMEGANVM_GetMemoryCRC(const uint8_t CRCCommand, uint32_t* const CRCDest)
 {
+	*CRCDest = 0;
+
 	/* Wait until the NVM controller is no longer busy */
 	if (!(XMEGANVM_WaitWhileNVMControllerBusy()))
 	  return false;