[Bug 1156] New: make macro mnl_attr_for_each_nested C++ friendly

[bugzilla-daemon at netfilter.org]

https://bugzilla.netfilter.org/show_bug.cgi?id=1156

            Bug ID: 1156
           Summary: make macro mnl_attr_for_each_nested C++ friendly
           Product: libmnl
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: libmnl
          Assignee: pablo at netfilter.org
          Reporter: yshragai.firmware at gmail.com

Macro mnl_attr_for_each_nested contains a conversion from void* to struct
nlattr*.  (It contains a call to mnl_attr_get_payload(), which returns void*;
the result is assigned to arg0 of the macro, which is struct nlattr*.)

Therefore, C++ compilation fails.  (g++ throws "error: invalid conversion from
‘void*’ to ‘const nlattr*’.")

This is similar to the issue with macro nla_for_each_nested in libnl, that has
been fixed by adding a cast:
https://github.com/thom311/libnl/commit/cdf2d4baf376e4a3030a2c1169516358b4fba2e5

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