Fix error reported by Valgrind

[wddgit]

Fix this error:
==6514== Mismatched free() / delete / delete []
reported by valgrind. This is a minimal fix for the
reported problem.

Note there are some other strange looking things in the file
that I did not fix. The following line appears to mistakenly
use ">" instead of "<"
if (matchedCand.pt() > ptBins.at(0)) { // underflow problem

This fix is for 7_0_X and 7_1_X. There are similar
problems in 6_2_X which someone might want to fix if this
is used in 6_2_X, although the code has been modified since
then so the exact same fix will not work.

[cmsbuild]

A new Pull Request was created by @wddgit (W. David Dagenhart) for CMSSW_7_0_X.

Fix error reported by Valgrind

It involves the following packages:

DQMOffline/PFTau

@ojeda, @danduggan, @rovere, @cmsbuild, @nclopezo, @deguio, @Degano can you please review it and eventually sign? Thanks.
You can sign-off by replying to this message having '+1' in the first line of your reply.
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@nclopezo, @ktf you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[cmsbuild]

+1
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-2299/12/summary.html

[ktf]

Bypassing DQM and ORP signature, since this is obviously a bug fix.

@davidlange6