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vmx(1): obsdfb: check if curmode is nil

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

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

@@ -562,7 +562,7 @@

 	extern VgaMode *curmode, textmode;

 	extern uintptr fbaddr, fbsz;

-	if(curmode == &textmode) return;

+	if(curmode == nil || curmode == &textmode) return;

 	p = r = g = b = a = 0;

 	for(i = 0; i < 4; i++){

 		s = curmode->chan >> 8 * i & 0xf;