Replace getcpy() with mh_xstrdup() where the string isn't NULL.

[nmh] / etc / mhshow.marker

%;
%; This is provided as reference only; it shows the default content marker
%; used by mhshow when it decides to not display content.
%;
[ part %{part} - %{content-type} - %<{description}\
%{description}%?{cdispo-filename}%{cdispo-filename}%|%{ctype-name}%>  \
%(kilo(size))B %<(unseen)\(suppressed\)%> ]