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ktrace(1): handle amd64 stacktraces correctly

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

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

@@ -370,7 +370,7 @@

 {

 	char buf[256];

 	int i, n;

-	uvlong r;

+	uvlong r, m;

 	if(interactive){

 		print("// data at %#8.8llux? ", a);

@@ -379,17 +379,25 @@

 			return 0;

 		buf[n] = '\0';

 		r = strtoull(buf, 0, 16);

+	}else{

+		r = 0;

 		switch(fhdr.magic){

 		case S_MAGIC:

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

+			m = 0xffffffff00000000ULL;

 			break;

+		default:

+			m = 0;

 		}

-	}else{

-		r = 0;

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

-			if(addr[i] == a)

+			if((addr[i]|m) == a)

 				r = val[i];

 	}

+	switch(fhdr.magic){

+	case S_MAGIC:

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

+		break;

+	}

+

 	return r;

 }