fix(stereo): simplify cleanup classification

pkg/service/soundtouchweb/handler_stereopair.go

@@ -385,9 +385,11 @@ func stereoPairHTTPStatus(result stereopair.Result) int {
 	if resultHasStereoPairError(result, stereopair.ErrInvalidRequest) {
 		return http.StatusBadRequest
 	}
+
 	if resultHasStereoPairError(result, stereopair.ErrConflict) {
 		return http.StatusConflict
 	}
+
 	if result.Status == stereopair.StatusDegraded {
 		return http.StatusBadGateway
 	}

pkg/stereopair/marge_cleanup.go

@@ -73,16 +73,26 @@ func DeleteMargeGroupGeneration(httpClient *http.Client, ref GenerationRef) erro
 		return err
 	}
 
-	if response.StatusCode == http.StatusInternalServerError && margeWrappedGroupNotFound(body, ref) {
+	return handleMargeGenerationCleanupFailure(httpClient, ref, response.StatusCode, body)
+}
+
+func handleMargeGenerationCleanupFailure(
+	httpClient *http.Client,
+	ref GenerationRef,
+	statusCode int,
+	body []byte,
+) error {
+	if statusCode == http.StatusInternalServerError && margeWrappedGroupNotFound(body, ref) {
 		return verifyMargeGroupGenerationDeleted(httpClient, ref)
 	}
-	if response.StatusCode == http.StatusConflict {
+
+	if statusCode == http.StatusConflict {
 		return fmt.Errorf("%w: delete Marge group generation: HTTP %d: %s",
-			ErrConflict, response.StatusCode, strings.TrimSpace(string(body)))
+			ErrConflict, statusCode, strings.TrimSpace(string(body)))
 	}
 
 	return fmt.Errorf("delete Marge group generation: HTTP %d: %s",
-		response.StatusCode, strings.TrimSpace(string(body)))
+		statusCode, strings.TrimSpace(string(body)))
 }
 
 func readMargeGenerationCleanupResponse(response *http.Response) ([]byte, error) {