Revert changes, only bug-fix

Signed-off-by: alperozturk <alper_ozturk@proton.me>

app/src/main/java/com/owncloud/android/ui/fragment/OCFileListFragment.java

@@ -924,45 +924,39 @@ public class OCFileListFragment extends ExtendedListFragment implements
      * return       Count of folder levels browsed up.
      */
     public int onBrowseUp() {
-        if (mFile == null) {
-            return 0;
-        }
-
-        OCFile parentDir = null;
+        OCFile parentDir;
         int moveCount = 0;
-        FileDataStorageManager storageManager = mContainerActivity.getStorageManager();
-        String parentPath = null;
 
-        if (mFile.getParentId() != FileDataStorageManager.ROOT_PARENT_ID) {
-            parentPath = new File(mFile.getRemotePath()).getParent();
-            if (parentPath != null) {
+        if (mFile != null) {
+            FileDataStorageManager storageManager = mContainerActivity.getStorageManager();
+
+            String parentPath = null;
+            if (mFile.getParentId() != FileDataStorageManager.ROOT_PARENT_ID) {
+                parentPath = new File(mFile.getRemotePath()).getParent();
                 parentPath = parentPath.endsWith(OCFile.PATH_SEPARATOR) ? parentPath :
                     parentPath + OCFile.PATH_SEPARATOR;
                 parentDir = storageManager.getFileByPath(parentPath);
                 moveCount++;
+            } else {
+                parentDir = storageManager.getFileByPath(ROOT_PATH);
             }
-        } else {
-            parentDir = storageManager.getFileByPath(ROOT_PATH);
-        }
-
-        while (parentDir == null) {
-            parentPath = new File(parentPath).getParent();
-            if (parentPath != null) {
+            while (parentDir == null) {
+                parentPath = new File(parentPath).getParent();
                 parentPath = parentPath.endsWith(OCFile.PATH_SEPARATOR) ? parentPath :
                     parentPath + OCFile.PATH_SEPARATOR;
                 parentDir = storageManager.getFileByPath(parentPath);
                 moveCount++;
-            }
-        }
+            }   // exit is granted because storageManager.getFileByPath("/") never returns null
+            mFile = parentDir;
 
-        mFile = parentDir;
+            listDirectory(mFile, MainApp.isOnlyOnDevice(), false);
 
-        listDirectory(mFile, MainApp.isOnlyOnDevice(), false);
+            onRefresh(false);
 
-        onRefresh(false);
+            // restore index and top position
+            restoreIndexAndTopPosition();
 
-        // restore index and top position
-        restoreIndexAndTopPosition();
+        }   // else - should never happen now
 
         return moveCount;
     }