schweikert / fping / 20999360723

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avoid crash with option -0

Instead of using the possible option character '0' (ASCII value 0x30)
to indicate a long option without a short alias, use the value 0 as
indicator.  This value is treated specially by the used option parsing
code, and might even be the intended value to use for long-only options.

Before, using option `-0` sometimes, but not always, resulted in a
crash with `Segmentation fault (core dumped)`.

This fixes GitHub issue #456.

1 of 1 new or added line in 1 file covered. (100.0%)

1619 of 1839 relevant lines covered (88.04%)

353.88 hits per line