Fix function protypes for clang errors

clang-15+ has started diagnosing them as errors

thread.c:925:18: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
| void STATS_UNLOCK() {
|                  ^
|                   void

Signed-off-by: Khem Raj <raj.khem@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/testapp.c b/testapp.c
index 5face54..387a847 100644
--- a/testapp.c
+++ b/testapp.c
@@ -80,7 +80,7 @@ static struct conn *con = NULL;
 static bool allow_closed_read = false;
 static bool enable_ssl = false;
 
-static void close_conn() {
+static void close_conn(void) {
     if (con == NULL) return;
 #ifdef TLS
     if (con->ssl) {