make missingPermissionThrown atomic to fix: Shared primitive variable "missingPermissionThrown" in one thread may not yield the value of the most recent write from another thread

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

Author: alperozturk96

app/src/main/java/com/owncloud/android/operations/UploadFileOperation.java

@@ -169,7 +169,7 @@ public class UploadFileOperation extends SyncOperation {
 
     private boolean encryptedAncestor;
     private OCFile duplicatedEncryptedFile;
-    private boolean missingPermissionThrown = false;
+    private AtomicBoolean missingPermissionThrown = new AtomicBoolean(false);
 
     public static OCFile obtainNewOCFileToUpload(String remotePath, String localPath, String mimeType) {
         OCFile newFile = new OCFile(remotePath);
@@ -410,7 +410,7 @@ public Context getContext() {
     }
 
     public boolean isMissingPermissionThrown() {
-        return missingPermissionThrown;
+        return missingPermissionThrown.get();
     }
 
     @Override
@@ -430,7 +430,7 @@ protected RemoteOperationResult run(OwnCloudClient client) {
         if (!localFile.canRead()) {
             Log_OC.e(TAG, "Upload cancelled for " + getStoragePath() + ": file is not readable or inaccessible.");
             UploadFileOperationExtensionsKt.showStoragePermissionNotification(this);
-            missingPermissionThrown = true;
+            missingPermissionThrown.set(true);
             return new RemoteOperationResult<>(new UploadFileException.MissingPermission());
         }