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vesa: fix blank/unblank wakeups

it could happen that we unblanked while vesaproc was
currently blanking (when manually blanking using vgactl
for example). the wakeup of the unblank is lost.

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

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

@@ -163,9 +163,9 @@

 }

 static int

-vesadisabled(void *)

+gotctl(void *arg)

 {

-	return vesactl == Cdisable;

+	return vesactl != *((int*)arg);

 }

 static void

@@ -172,13 +172,16 @@

 vesaproc(void*)

 {

 	Ureg u;

+	int ctl;

-	while(vesactl != Cdisable){

+	ctl = Cenable;

+	while(ctl != Cdisable){

 		if(!waserror()){

-			sleep(&vesar, vesadisabled, nil);

+			sleep(&vesar, gotctl, &ctl);

+			ctl = vesactl;

 			vbesetup(&u, 0x4f10);

-			if(vesactl == Cblank)

+			if(ctl == Cblank)

 				u.bx = 0x0101;

 			else	

 				u.bx = 0x0001;

-- 

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