Incorrect auto-correction

[tomhughes]

When run on this code:

netmask = (~IPAddr.new(address).mask(0)).mask(prefix)

rubocop reports:

cookbooks/networking/recipes/default.rb:38:56: C: Don't use parentheses around a method call.

and corrects it to:

netmask = ~IPAddr.new(address).mask(0).mask(prefix)

but removing the parentheses means than the ~ is applied after the call to the mask method instead of before it.

This is a change between 0.34.2 and 0.36.0 as the earlier version didn't complain about this code.

[bbatsov]

Seems we failed to account for unary ops in this cop.

[lumeet]

Ouch, I'll take care of this.