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games/galaxy: simplify zoom loop

--- a/sys/src/games/galaxy/galaxy.c

+++ b/sys/src/games/galaxy/galaxy.c

@@ -356,33 +356,23 @@

 	double f, olds;

 	setcursor(mc, &zoomcursor);

+

+	z = mc->xy;

+	olds = scale;

 	for(;;) {

-		for(;;) {

-			readmouse(mc);

-			if(mc->buttons == 0)

-				continue;

-			if(mc->buttons != 2)

-				goto End;

+		readmouse(mc);

+		if(mc->buttons != 2)

 			break;

-		}

-		z = mc->xy;

-		olds = scale;

+		d = subpt(mc->xy, z);

+		f = tanh((double)d.y/200) + 1;

 		pause(0, 0);

-		for(;;) {

-			readmouse(mc);

-			if(mc->buttons != 2)

-				break;

-			drawglxy();

-			line(screen, z, (Point){z.x, mc->xy.y}, Enddisc, Enddisc, 0, display->white, ZP);

-			d = subpt(mc->xy, z);

-			f = tanh((double)d.y/200) + 1;

-			scale = f*olds;

-		}

+		scale = f*olds;

+		drawglxy();

 		pause(1, 0);

 	}

-End:

 	setcursor(mc, cursor);

+	pause(1, 0);

 }

 void