Trackbar negative and null range avoiding

[biggun from the sun]

Changelog:
- Avoid division by zero in TRACKBAR_GetTicPos
- Manage negative range TRACKBAR_DrawOneTic

Index: dlls/comctl32/trackbar.c
===================================================================
RCS file: /home/wine/wine/dlls/comctl32/trackbar.c,v
retrieving revision 1.50
diff -u -u -r1.50 trackbar.c
--- dlls/comctl32/trackbar.c	2 Aug 2003 00:44:00 -0000	1.50
+++ dlls/comctl32/trackbar.c	2 Aug 2003 05:52:42 -0000
@@ -442,7 +442,7 @@
     }

     range = infoPtr->lRangeMax - infoPtr->lRangeMin;
-    if (range == 0)
+    if (range <= 0)
       range = 1; /* to avoid division by zero */

     if (flags & TIC_SELECTIONMARK) {
@@ -966,6 +966,7 @@

     tic   = TRACKBAR_GetTic (infoPtr, iTic);
     range = infoPtr->lRangeMax - infoPtr->lRangeMin;
+    if (range <= 0) range = 1;
     width = infoPtr->rcChannel.right - infoPtr->rcChannel.left;
     pos   = infoPtr->rcChannel.left + (width * tic) / range;

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