[BUGFIX] Only persist processedFile if processing was successful

Due to multiple reasons (for instance target folder is not writable)
the processing of a file can fail.

This change prevents wrong data being saved in sys_file_processedfile
when processing failed.

Resolves: #67094
Releases: master, 6.2
Change-Id: I6051d503ba74629dc6493b7bac9f28bf320aeb66
Reviewed-on: http://review.typo3.org/39696


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Frank Nägler <typo3@naegler.net>
Tested-by: Frank Nägler <typo3@naegler.net>