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pc kernel: don't use active.thunderbirdsargo in vunmap() tlb flush code

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

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

@@ -679,7 +679,7 @@

 	 * boot. In that case it suffices to flush the MACH(0) TLB

 	 * and return.

 	 */

-	if(!active.thunderbirdsarego){

+	if(up == nil){

 		putcr3(PADDR(MACHP(0)->pdb));

 		return;

 	}