[Bug fortran/69456] Namelist value with trailing sign is ignored without error

[jvdelisle at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69456

--- Comment #6 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
Created attachment 37707
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37707&action=edit
A patch to fix this.

This patch enables the error message.  It regression tests OK.