Revert deadlock fix in ProcessGetData
Revert deadlock fix in ProcessGetData

Fix was introdeced in:
https://github.com/dashpay/dash/pull/1169
A fix was later applied to fix a race condition:
https://github.com/dashpay/dash/pull/1178

This has to be reverted to be able to backport multiple changes from Bitcoin.
Later backported PRs from Bitcoin will remove cs_mapRelay and thus also
remove the deadlock that was initially fixed with the above PRs.

nmarley/dash,thelazier/dash,UdjinM6/dash,ionomy/ion,nmarley/dash,ionomy/ion,nmarley/dash,UdjinM6/dash,ivansib/sibcoin,ionomy/ion,ivansib/sibcoin,biblepay/biblepay,biblepay/biblepay,biblepay/biblepay,ivansib/sibcoin,dashpay/dash,crowning-/dash,crowning-/dash,UdjinM6/dash,biblepay/biblepay,nmarley/dash,biblepay/biblepay,thelazier/dash,biblepay/biblepay,thelazier/dash,biblepay/biblepay,nmarley/dash,thelazier/dash,crowning-/dash,dashpay/dash,nmarley/dash,crowning-/dash,biblepay/biblepay,UdjinM6/dash,ionomy/ion,UdjinM6/dash,dashpay/dash,crowning-/dash,crowning-/dash,ivansib/sibcoin,ivansib/sibcoin,nmarley/dash,dashpay/dash,thelazier/dash,ionomy/ion,dashpay/dash,ivansib/sibcoin,ionomy/ion