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pc64: fix mmu leak

--- a/sys/src/9/pc64/mmu.c

+++ b/sys/src/9/pc64/mmu.c

@@ -415,7 +415,7 @@

 	if((p = proc->kmaptail) != nil){

 		if((p->next = proc->mmuhead) == nil)

 			proc->mmutail = p;

-		proc->mmuhead = p;

+		proc->mmuhead = proc->kmaphead;

 		proc->mmucount += proc->kmapcount;

 		proc->kmaphead = proc->kmaptail = nil;