BUILD: dns: avoid a build warning when threads are disabled (dss unused)

dns_session_release() only uses its struct dns_stream_server to access
the lock, so a warning is emitted when threads are disabled. Let's mark
it __maybe_unused.

diff --git a/src/dns.c b/src/dns.c
index cb30bff..69364eb 100644 (file)
--- a/src/dns.c
+++ b/src/dns.c
@@ -780,7 +780,7 @@ static struct appctx *dns_session_create(struct dns_session *ds);
 static void dns_session_release(struct appctx *appctx)
 {
        struct dns_session *ds = appctx->ctx.sft.ptr;
-       struct dns_stream_server *dss;
+       struct dns_stream_server *dss __maybe_unused;
 
        if (!ds)
                return;