CLEANUP: fix all duplicated semicolons

trivial commit, does not change the code behaviour

Signed-off-by: William Dauchy <w.dauchy@criteo.com>
diff --git a/src/mux_fcgi.c b/src/mux_fcgi.c
index 8750498..ab9ddf0 100644
--- a/src/mux_fcgi.c
+++ b/src/mux_fcgi.c
@@ -825,7 +825,7 @@
  */
 static void fcgi_release(struct fcgi_conn *fconn)
 {
-	struct connection *conn = NULL;;
+	struct connection *conn = NULL;
 
 	TRACE_POINT(FCGI_EV_FCONN_END);