I've discovered a bug in same_is while fixing deletion in CLUSTERIP.

CLUSTERIP has to define a different userspacesize for the private target 
info because of the config pointer, this should be enough to fix rule 
deletion but the function same_is returns a wrong pointer to the 
comparation mask array since it doesn't add the size of ipt_entry. 
Because of that, target_same returns 0 and no rule matches.

Impact: This just affects rule deletion with targets that has 
userspacesize != size.

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Pablo