user32[1/3]: don't create timers with nEventId == 0 in TrackMouseEvent

[Mikołaj Zalewski]

When hwnd!=NULL, nEventId ==0 doesn't seach for an empty ID but creates 
a timer with ID 0 and returns 1. Instead I pass a pointer to a structure 
we use as it shouldn't collide with any other ID.
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diff --git a/dlls/user/input.c b/dlls/user/input.c
index 2be1cf5..ae64979 100644
--- a/dlls/user/input.c
+++ b/dlls/user/input.c
@@ -967,7 +967,7 @@ TrackMouseEvent (TRACKMOUSEEVENT *ptme)
             /* Initialize HoverInfo variables even if not hover tracking */
             tracking_info.pos = pos;
 
-            timer = SetSystemTimer(tracking_info.tme.hwndTrack, 0, hover_time, TrackMouseEventProc);
+            timer = SetSystemTimer(tracking_info.tme.hwndTrack, (UINT_PTR)&tracking_info.tme, hover_time, TrackMouseEventProc);
         }
     }
 
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1.4.2.3