no need to declare the variable outside of the loop

Change-Id: I4f910494114f7dd965a75f3f9482153e0268b89c

basegfx/source/polygon/b2dtrapezoid.cxx

@@ -420,9 +420,7 @@ namespace basegfx
                     // there were horizontal edges. These can be excluded, but
                     // cuts with other edges need to be solved and added before
                     // ignoring them
-                    sal_uInt32 a(0);
-
-                    for(a = 0; a < rTrDeSimpleEdges.size(); a++)
+                    for(sal_uInt32 a = 0; a < rTrDeSimpleEdges.size(); a++)
                     {
                         // get horizontal edge as candidate; prepare its range and fixed Y
                         const TrDeSimpleEdge& rHorEdge = rTrDeSimpleEdges[a];