dplayx: Remove unnecessary assigment (Coverity).

[wine] / dlls / rstrtmgr / rstrtmgr.spec

@ stub RmAddFilter
@ stub RmCancelCurrentTask
@ stdcall RmEndSession(long)
@ stub RmGetFilterList
@ stdcall RmGetList(long ptr ptr ptr ptr)
@ stub RmJoinSession
@ stdcall RmRegisterResources(long long ptr long ptr long ptr)
@ stub RmRemoveFilter
@ stub RmReserveHeap
@ stdcall RmRestart(long long ptr)
@ stub RmShutdown
@ stdcall RmStartSession(ptr long ptr)