ws2_32/tests: Wait for thread test before returning (valgrind)

[Bruno Jesus]

Fixes bug https://bugs.winehq.org/show_bug.cgi?id=28756
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diff --git a/dlls/ws2_32/tests/sock.c b/dlls/ws2_32/tests/sock.c
index 0bbce27..1b59c27 100644
--- a/dlls/ws2_32/tests/sock.c
+++ b/dlls/ws2_32/tests/sock.c
@@ -5454,6 +5454,7 @@ static void test_WSARecv(void)
 
     send(src, "test message", sizeof("test message"), 0);
     thread = CreateThread(NULL, 0, recv_thread, &dest, 0, &id);
+    WaitForSingleObject(thread, 3000);
     CloseHandle(thread);
 
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