[bugfx][test] Fix memory leak in test
Return unique_ptr
instead of raw pointer in constructCoarseYaspGrid
to fix memory leaks in istlbackendtest.cc
and newpfeassemblertest.cc
.
Return unique_ptr
instead of raw pointer in constructCoarseYaspGrid
to fix memory leaks in istlbackendtest.cc
and newpfeassemblertest.cc
.