Remove side effect in assertion in ProcessGetData
Remove side effect in assertion in ProcessGetData

A side-effect was introduced into an assertion in 7a0e84d. This commit
fixes that.

(cherry picked from commit 4a48a0671d2e02ba2a86af98282a452f23546b9e)

reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin