Slightly refactor ProcessInstantSendLock (#2767)
Slightly refactor ProcessInstantSendLock (#2767)

Rewrite `if (var =  func())` in a less confusing way
thelazier/dash,dashpay/dash,ionomy/ion,thelazier/dash,ionomy/ion,nmarley/dash,UdjinM6/dash,nmarley/dash,ionomy/ion,dashpay/dash,UdjinM6/dash,ionomy/ion,UdjinM6/dash,nmarley/dash,UdjinM6/dash,nmarley/dash,ionomy/ion,thelazier/dash,dashpay/dash,ionomy/ion,dashpay/dash,dashpay/dash,thelazier/dash,nmarley/dash,UdjinM6/dash,nmarley/dash,nmarley/dash,thelazier/dash