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Fix "GCC diagnostic" in socketmodule.c

Fix regression of changeset 7c6e3358221a on GCC < 4.4. The _socket module
cannot be compiled on "x86 FreeBSD 7.2 3.x" buildbot anymore.
V
Victor Stinner committed
a4c727131efc4b1a7f08d837d20bd9f592197e52
Parent: d7c7e0e