Fix in SetState polling loop

Once the pFeedback->Header.hEvent event is set, the game is free to free
the buffer that it was pointing to. In HP1 game, the pointer
even lead to the stack. Because that stack was changing a lot,
pFeedback->Header.dwStatus eventually resolved to a non-zero
value and we started to overwrite some random memory.

src/CxbxKrnl/EmuD3D8.cpp

@@ -1782,12 +1782,15 @@ static DWORD WINAPI EmuUpdateTickCount(LPVOID)
 
                 if(pFeedback->Header.dwStatus != ERROR_SUCCESS)
                 {
+                    pFeedback->Header.dwStatus = ERROR_SUCCESS;
+
                     if(pFeedback->Header.hEvent != 0)
                     {
                         SetEvent(pFeedback->Header.hEvent);
                     }
 
-                    pFeedback->Header.dwStatus = ERROR_SUCCESS;
+                    //Make sure we don't check the pFeedback again, as it could be freed by the game
+                    g_pXInputSetStateStatus[v].pFeedback = 0;
                 }
             }
         }