-more verbose output in test

GetRuntimeAddresses/symbolyze/gdb_test.go

@@ -75,7 +75,9 @@ func TestSimpleGDB(t *testing.T) {
 		if off2, ok := ourResults[pid]; !ok {
 			t.Fatalf("Scanner has no offset for pid %d", pid)
 		} else if off != off2 {
-			t.Fatalf("Scanner has found offset %d while gdb has found offset %d for pid %d", off2, off, pid)
+			t.Fatalf("Scanner has found offset %x while gdb has found offset %x for pid %d", off2, off, pid)
+		} else {
+			t.Logf("Scanner and gdb agree: pid %d at offset %x", pid, off)
 		}
 	}
 }