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games/doom: handle allocimage() failure

--- a/sys/src/games/doom/i_video.c

+++ b/sys/src/games/doom/i_video.c

@@ -96,7 +96,7 @@

 	if(resized){

 		resized = 0;

 		if(getwindow(display, Refnone) < 0)

-			sysfatal("getwindow failed: %r");

+			sysfatal("getwindow: %r");

 		/* make black background */

 		draw(screen, screen->r, display->black, nil, ZP);

@@ -117,6 +117,8 @@

 	/* the row image, y-axis gets scaled with repl flag */

 	rowimg = allocimage(display, Rect(0, 0, scale*SCREENWIDTH, 1), RGB24, 1, DNofill);

+	if(rowimg == nil)

+		sysfatal("allocimage: %r");

 	s = screens[0];

 	for(y = 0; y < SCREENHEIGHT; y++){

-- 

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