ginput.m: Stop feval error when ginput called multiple times (bug #45261). * ginput.m: Restore the original closereq function for the figure at the end of a normal termination of ginput.

%!function r = f (x)
%!  if (ischar (x))
%!    r = x;
%!  else
%!    error ("expecting character string");
%!  endif
%!endfunction

%!assert (eval ("f 10;"), "10");