xterm: fix wrong HLS-to-RGB conversion

xterm-fix-hls2rgb.patch

diff --git a/graphics.c b/graphics.c
index 4bd50b4..b6f9e54 100644
--- a/graphics.c
+++ b/graphics.c
@@ -1089,7 +1089,7 @@ outline_refresh(TScreen const *screen,
 void
 hls2rgb(int h, int l, int s, short *r, short *g, short *b)
 {
-    const int hs = ((h + 240) / 60) % 6;
+    const int hs = ((h = (h + 240) % 360) / 60) % 6;
     const double lv = l / 100.0;
     const double sv = s / 100.0;
     double c, x, m, c2;
@@ -1110,33 +1110,33 @@ hls2rgb(int h, int l, int s, short *r, short *g, short *b)
     switch (hs) {
     case 0:
 	r1 = c;
-	g1 = x;
+	g1 = c * h / 60.0;
 	b1 = 0.0;
 	break;
     case 1:
-	r1 = x;
+	r1 = c * (120 - h) / 60.0;
 	g1 = c;
 	b1 = 0.0;
 	break;
     case 2:
 	r1 = 0.0;
 	g1 = c;
-	b1 = x;
+	b1 = c * (h - 120) / 60.0;
 	break;
     case 3:
 	r1 = 0.0;
-	g1 = x;
+	g1 = c * (240 - h) / 60.0;
 	b1 = c;
 	break;
     case 4:
-	r1 = x;
+	r1 = c * (h - 240) / 60.0;
 	g1 = 0.0;
 	b1 = c;
 	break;
     case 5:
 	r1 = c;
 	g1 = 0.0;
-	b1 = x;
+	b1 = c * (360 - h) / 60.0;
 	break;
     default:
 	TRACE(("Bad HLS input: [%d,%d,%d], returning white\n", h, l, s));