use opened storageIO

Author: qqmyers

src/main/java/edu/harvard/iq/dataverse/util/FileUtil.java

@@ -442,7 +442,7 @@ public static String determineRemoteFileType(DataFile df, String fileName) {
                 try {
                     StorageIO<DataFile> storage = df.getStorageIO();
                     storage.open(DataAccessOption.READ_ACCESS);
-                    try (InputStream is = df.getStorageIO().getInputStream()) {
+                    try (InputStream is = storage.getInputStream()) {
 
                         // Read the first 42 bytes of the file to determine the file type
                         byte[] buffer = new byte[42];