[PATCH] ctdb-tests: Fix CTDB -O3 --picky-developer build on CentOS 7

[Martin Schwenke]

gcc 4.8.5 complains:

[319/381] Compiling ctdb/tests/src/system_socket_test.c
../tests/src/system_socket_test.c: In function ‘test_tcp’:
../tests/src/system_socket_test.c:196:20: error: ‘rst_out’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  assert((rst != 0) == (rst_out != 0));
                    ^
cc1: all warnings being treated as errors

Please review and maybe push...

peace & happiness,
martin
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