Fix inconsistent behavior between IPAddr.new("0.0.0.0") == nil and nil == IPAddr.new("0.0.0.0")

[taketo1113]

Summary

This Pull Request fixes inconsistent behavior between IPAddr.new("0.0.0.0") == nil and nil == IPAddr.new("0.0.0.0").

This is to verify whether the following Pull Request for the ipaddr gem works in a real Ruby application.

• Fix IPAddr#== returning true when compared with nil for 0.0.0.0 and :: ruby/ipaddr#76

Changes

# IPv4
IPAddr.new("0.0.0.0") == nil
#=> true # expected false

nil == IPAddr.new('0.0.0.0')
#=> false

IPAddr.new("0.0.0.0").nil?
#=> false

# IPv6
IPAddr.new("::") == nil
#=> true # expected false

nil == IPAddr.new("::")
#=> false

IPAddr.new("::").nil?
#=> false

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