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ktrace: sign extend stack dump pc for amd64

--- a/sys/src/cmd/ktrace.c

+++ b/sys/src/cmd/ktrace.c

@@ -379,6 +379,11 @@

 			return 0;

 		buf[n] = '\0';

 		r = strtoull(buf, 0, 16);

+		switch(fhdr.magic){

+		case S_MAGIC:

+			r = (long)r;	// sign extend

+			break;

+		}

 	}else{

 		r = 0;

 		for(i=0; i<naddr; i++)