Revert "Avoid loplugin:staticmethods in non-debug build"

This reverts commit d0ba487b, obsoleted by
cbce40e9 "Make content of OSL_ASSERT,
DBG_ASSERT, etc. visiblie in non-debug builds."

basegfx/source/range/b2drangeclipper.cxx

@@ -370,7 +370,6 @@ namespace basegfx
                 OSL_ENSURE( isSweepLineEnteringRect ||
                             mpLeadingRightEdge == &rActiveEdge,
                             "ImplPolygon::intersect(): sweep initial own edge hit: wrong leading edge" );
-                (void) this; // avoid loplugin:staticmethods
             }
 
             void handleFinalOwnRightEdge(ActiveEdge& rActiveEdge)