Fix flash write error handling; clean up safe mode message printing #2381
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nrf_nvm_safe_flash_page_write()
was throwing Python exceptions, though it could be called from a non-Python context. Have it return success/failure and have the callers handle the error.FLASH_WRITE_FAIL
to possible reasons to go into safe mode.FLASH_WRITE_FAIL
, redidprint_safe_mode_message()
so it uses case statements and reduces the length of the messages.This is a clean-up follow-on to #2376.