[Clang] Fix warning about an unchecked enumerator in switch().
/home/joe/Projekte/dune-simd/dune-istl/dune/istl/matrixmarket.hh:706:18: warning: enumeration values 'general' and 'unknown_structure' not handled in switch [-Wswitch]
switch(mmHeader.structure)- Move the
switch(mmHeader.structure)out of the loop over the entries and and check all structure types there. This will throw immediately for unknown structure types, rather then reading all entries and then throwing. - Write the
for()loop in a less unusual format; i.e. don't try and save on local integer variables.
