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vmx: fix hlt idle problem

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

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

@@ -434,7 +434,7 @@

 static void

 hlt(ExitInfo *ei)

 {

-	if(irqactive == 0)

+	if(irqactive < 0)

 		state = VMHALT;

 	skipinstr(ei);

 }

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

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

@@ -282,7 +282,7 @@

 	case 0x20:

 	case 0xa0:

 		if((val & 1<<4) != 0){ /* ICW1 */

-			if(irqactive){

+			if(irqactive >= 0){

 				if(ctl("irq") < 0)

 					sysfatal("ctl: %r");

 				irqactive = -1;