in do_spell(), when setting i to the return value of

in do_spell(), when setting i to the return value of
write_(marked_)?file(), use the "?" operator instead of an if/else
clause

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@3970 35c25a1d-7b9e-4130-9fde-d3aeb78583b8