[PATCH] ifconfig: prefix length handling fixes for -A

[Erik Auerswald]

Hi,

while "ifconfig -A" now accepts CIDR notation, it does not reject prefix
length values outside of [0,32].  Also, with a prefix length of 0,
undefined begavior is invoked, and at least on x86_64 a wrong netmask
is computed.

I think the attached patch fixes this.

If it is OK, I can commit the changes.  What do you think?

Br,
Erik

0001-ifconfig-prefix-length-handling-fixes-for-A.patch
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