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pc64: properly handle faulterror in faultamd64()

replicate what faulterror() would have done with up->nerrlab == 0,
that is, terminate the process.

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

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

@@ -698,6 +698,10 @@

 	up->insyscall = 1;

 	f = fpusave();

 	if(!user && waserror()){

+		if(up->nerrlab == 0){

+			pprint("suicide: sys: %s\n", up->errstr);

+			pexit(up->errstr, 1);

+		}

 		int s = splhi();

 		fpurestore(f);

 		up->insyscall = insyscall;