[tex-k] Avoid ps2pk segv

[Hironobu Yamashita]

Hi,

Attached is a patch for ps2pk,
to avoid SEGV for invalid usage.
In the patch, some typo are also corrected.

$ ps2pk -X
Segmentation fault: 11
$ ps2pk -Y
Segmentation fault: 11
$ ps2pk -E
Segmentation fault: 11
$ ps2pk -S
Segmentation fault: 11
$ ps2pk -P
Segmentation fault: 11
$ ps2pk -R
Segmentation fault: 11

Hironobu
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