cmGr.c:Fixed unintialized variable 'rc' in cmGrWorldExt().

cmGr.c

 
 cmGrRC_t cmGrObjSetWorldLimitExt( cmGrH_t h, cmGrObjH_t oh, const cmGrVExt_t* vext, unsigned limitFlags )
 {
-  cmGrRC_t rc;
+  cmGrRC_t rc = kOkGrRC;
   cmGrObj_t* op = _cmGrObjHandleToPtr(oh);
 
   // store the current world extents