getstyle: Fix output to stdout

getstyle: Fix output to stdout

There is a problem with getstyle invoked with no arguments:

[mafra@Pilar:util]$ ./getstyle
Usage: getstyle [-t] [-p] [-h] [-v] [file]

or with -t:

[mafra@Pilar:util]$ ./getstyle -t
Usage: getstyle [-t] [-p] [-h] [-v] [file]

In both cases it is supposed to write to the standard output:

[mafra@Pilar:wmaker.git]$ getstyle -h
Usage: getstyle [-t] [-p] [-h] [-v] [file]
Retrieves style/theme configuration and output to FILE or to stdout

This regression was caused by commit 6bf79945201265dccf62 ("style Stuff up").
When that commit did

       argc -= optind;

       if (argc != 1)
               print_help(0,1);

it excluded the output to stdout as valid, because in this case
argc - optind is zero (see the manpage of getopt(3)).

The correct handling is to set the style_file only when there is
one non-option ARGV-element (argc - optind == 1) and print the
help message when there are more than one non-option element.