Fix spotbugs

Signed-off-by: Jonas Mayer <jonas.a.mayer@gmx.net>

app/src/main/java/com/owncloud/android/files/services/FileUploader.java

@@ -1262,6 +1262,7 @@ public class FileUploader extends Service
             }
         }
 
+        @SuppressFBWarnings("NP")
         public boolean isUploadingNow(OCUpload upload) {
             if (useFilesUploadWorker(getApplicationContext())){
                 UploadFileOperation currentUploadFileOperation = FilesUploadWorker.Companion.getCurrentUploadFileOperation();