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devvga: check if screen is setup before accepting hwgc vgactl

--- a/sys/src/9/pc/devvga.c

+++ b/sys/src/9/pc/devvga.c

@@ -257,6 +257,9 @@

 	ct = lookupcmd(cb, vgactlmsg, nelem(vgactlmsg));

 	switch(ct->index){

 	case CMhwgc:

+		if(scr->gscreen == nil)

+			error("hwgc: no gscreen");

+

 		if(strcmp(cb->f[1], "off") == 0){

 			lock(&cursor);

 			if(scr->cur){

-- 

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