fixed copy-and-paste error

client/src/main/java/dev/fitko/fitconnect/client/SubscriberClient.java

@@ -122,7 +122,7 @@ public class SubscriberClient {
             final ValidationResult dataSchemaValidation = subscriber.validateSubmissionDataSchema(new String(decryptedData, StandardCharset.UTF_8),
                     metadata.getContentStructure().getData().getSubmissionSchema().getSchemaUri());
             if (dataSchemaValidation.hasError()) {
-                LOGGER.error("Submission data does not match the provided schema", dataHashValidation.getError());
+                LOGGER.error("Submission data does not match the provided schema", dataSchemaValidation.getError());
                 return null;
             }