common gvToggle: squash -Wunused-parameter warning

diff --git a/lib/common/utils.c b/lib/common/utils.c
index f435ad0d344ec639a359dfb1e61574d30857542c..becac3a78e918cc34b843313fc5963070a39354f 100644 (file)
--- a/lib/common/utils.c
+++ b/lib/common/utils.c
@@ -522,6 +522,7 @@ pointf spline_at_y(splines * spl, double y)
 static int Tflag;
 void gvToggle(int s)
 {
+    (void)s;
     Tflag = !Tflag;
 #if !defined(_WIN32)
     signal(SIGUSR1, gvToggle);