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vmx: check for draw initialization errors

--- a/sys/src/cmd/vmx/vga.c

+++ b/sys/src/cmd/vmx/vga.c

@@ -756,8 +756,8 @@

 			sysfatal("got nil ptr for framebuffer");

 	}

 	snprint(buf, sizeof(buf), "-dx %d -dy %d", maxw+50, maxh+50);

-	newwindow(buf);

-	initdraw(nil, nil, "vmx");

+	if(newwindow(buf) < 0 || initdraw(nil, nil, "vmx") < 0)

+		sysfatal("failed to initialize graphics: %r");

 	screeninit(1);

 	flushimage(display, 1);

 	kbdlayout("/sys/lib/kbmap/us");

-- 

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