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The FFTJetCorrector is accessible via the EventSetup and therefore
all its const methods must be thread safe. Previously, the const
method 'correct' was using a member data for a temporary buffer
which was being changes on each call to 'correct'. To make the
routine thread safe we now use a buffer on the stack if only a small
buffer is needed and use a std::vector if a larger buffer is needed.
This problem was caught by the static analyzer.
Automatically ported from CMSSW_7_4_X #7682