Fix crash when cursor color is truecolor

Reported-by: Ivan Tham <pickfire@riseup.net>

x.c

@@ -1404,6 +1404,7 @@ void
 xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og)
 {
 	Color drawcol;
+	uint32_t cc;
 
 	/* remove the old cursor */
 	if (selected(ox, oy))
@@ -1419,14 +1420,22 @@ xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og)
 	g.mode &= ATTR_BOLD|ATTR_ITALIC|ATTR_UNDERLINE|ATTR_STRUCK|ATTR_WIDE;
 
 	if (selected(cx, cy)) {
-		drawcol = dc.col[g.bg];
+		cc = g.bg;
 	} else {
 		g.mode |= ATTR_REVERSE;
-
 		if (g.mode & ATTR_BOLD && BETWEEN(g.fg, 0, 7))
-			drawcol = dc.col[g.fg + 8];
+			cc = g.fg + 8;
 		else
-			drawcol = dc.col[g.fg];
+			cc = g.fg;
+	}
+
+	if (IS_TRUECOL(cc)) {
+		drawcol.color.alpha = 0xffff;
+		drawcol.color.red = TRUERED(cc);
+		drawcol.color.green = TRUEGREEN(cc);
+		drawcol.color.blue = TRUEBLUE(cc);
+	} else {
+		drawcol = dc.col[cc];
 	}
 
 	if (IS_SET(MODE_REVERSE)) {