add check in TOF compressor before to save RDH open - #13389

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This should fix an issue spotted in
https://its.cern.ch/jira/browse/O2-5231

in case of an issue in processTRM rewind didn't reset also start of buffer pointer.
In case of decoding error not-resetted starting pointer was used to replace current buffer point moving it outside the buffer

adding @preghenella