Show error if parameter incorrectly setted (percentage symbol) (#1237)

[waja]

This works as expected. From the help output:

 -w, --warning=INTEGER
    Exit with WARNING status if less than INTEGER units of disk are free
 -w, --warning=PERCENT%
    Exit with WARNING status if less than PERCENT of disk space is free
 -c, --critical=INTEGER
    Exit with CRITICAL status if less than INTEGER units of disk are free
 -c, --critical=PERCENT%
    Exit with CRITICAL status if less than PERCENT of disk space is free

If you want to specify inode limits, you need to specify:

 -W, --iwarning=PERCENT%
    Exit with WARNING status if less than PERCENT of inode space is free
 -K, --icritical=PERCENT%
    Exit with CRITICAL status if less than PERCENT of inode space is free

Cheers, Jan.

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