9cc8e30125df14fe47e21e55ab3bf26f4d416565 test: fix sign comparison warning in socket tests (fanquake)
Pull request description:
This fixes:
```bash
In file included from test/sock_tests.cpp:10:
In file included from /usr/local/include/boost/test/unit_test.hpp:18:
In file included from /usr/local/include/boost/test/test_tools.hpp:46:
/usr/local/include/boost/test/tools/old/impl.hpp:107:17: warning: comparison of integers of different signs: 'const long' and 'const unsigned long' [-Wsign-compare]
return left == right;
~~~~ ^ ~~~~~
```
which was introduced in #20788.
ACKs for top commit:
practicalswift:
cr ACK 9cc8e30125df14fe47e21e55ab3bf26f4d416565
vasild:
ACK 9cc8e30125df14fe47e21e55ab3bf26f4d416565
Tree-SHA512: 7069a4fde5cec01be03f8477fe396e53658f170efbf1d9ef3339d553bb90a2be9f4acd6b348127b14cd2f91426e0cd1fc35d2d3c9f201cf748c0cf50f47e46a5
