fixup! h7 fclose issue hotfix

Author: andreagilardoni

src/ota/implementation/OTASTM32H7.cpp

@@ -89,6 +89,10 @@ OTACloudProcessInterface::State STM32H7OTACloudProcess::flashOTA() {
   STM32H747::writeBackupRegister(RTCBackup::DR0, 0x07AA);
   STM32H747::writeBackupRegister(RTCBackup::DR1, storage);
   STM32H747::writeBackupRegister(RTCBackup::DR2, data_offset);
+
+  if(_program_length == 0) {
+    DEBUG_VERBOSE("Program length is 0");
+  }
   STM32H747::writeBackupRegister(RTCBackup::DR3, _program_length);
 
   return Reboot;