[issue1279] vnconfig: unintuitive error message

[Stathis Kamperis (via DragonFly issue tracker)]

Stathis Kamperis <ekamperi at gmail.com> added the comment:

: Perhaps make vnconfig print an error:
: "Either specify a regular filename or the size of a swap backing store via   :
-S" ?

I omitted the -S flag to avoid ambiguity from the user point of view (ie, does
-S refer to swap size or filename also?) based on discussion at #dragonflybsd.
Also I switched printf() to warnx().

Patch in, as before:
http://stathisk.ath.cx/patches/dragonflybsd/vnconfig

Cheers,
Stathis

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