Fix test breaking due to vet checks

Some incorrect fmt formatting strings broke tests due to vet checks
being automatically applied since Go 1.10.

controlblock.go

@@ -284,7 +284,7 @@ func ParseControlBlock(data []byte) (*ControlBlock, error) {
 		cb.Data = &Preamble{}
 		break
 	default:
-		return nil, fmt.Errorf("dmr: unknown CSBK opcode %#02x (%#06b)", cb.Opcode, cb.Opcode)
+		return nil, fmt.Errorf("dmr: unknown CSBK opcode %02x (%06b)", cb.Opcode, cb.Opcode)
 	}
 
 	if err := cb.Data.Parse(data); err != nil {

dataheader.go

@@ -350,7 +350,7 @@ type ResponseData struct {
 }
 
 func (d ResponseData) String() string {
-	return fmt.Sprintf("response, blocks %d, type %s (%#02b %#03b), status %d",
+	return fmt.Sprintf("response, blocks %d, type %s (%02b %03b), status %d",
 		d.BlocksToFollow, ResponseTypeName[d.ClassType], (d.ClassType >> 3), (d.ClassType & 0x07), d.Status)
 }
 

dataheader_test.go

@@ -211,7 +211,7 @@ func TestDataHeaderShortDataDefined(t *testing.T) {
 		t.Fatalf("decode failed: appended blocks wrong")
 
 	case d.DDFormat != DDFormatUTF16:
-		t.Fatalf("decode failed: dd format wrong, expected UTF-16, got %d", DDFormatName[d.DDFormat])
+		t.Fatalf("decode failed: dd format wrong, expected UTF-16, got %s", DDFormatName[d.DDFormat])
 
 	case d.Resync:
 		t.Fatalf("decode failed: rsync bit wrong")