kernel32: change pointer cast from DWORD to DWORD_PTR

[Austin English]

-- 
-Austin
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diff --git a/dlls/kernel32/selector.c b/dlls/kernel32/selector.c
index c8841b1..6c077c6 100644
--- a/dlls/kernel32/selector.c
+++ b/dlls/kernel32/selector.c
@@ -504,7 +504,7 @@ SEGPTR WINAPI MapLS( LPCVOID ptr )
             free->next = first_entry;
             first_entry = free;
         }
-        SetSelectorBase( free->sel, (DWORD)base );
+        SetSelectorBase( free->sel, (DWORD_PTR)base );
         free->addr = (void*)base;
         entry = free;
     }