add @nullable

Signed-off-by: alperozturk <[email protected]>

Author: alperozturk96

app/src/main/java/com/owncloud/android/utils/BitmapUtils.java

@@ -76,6 +76,7 @@ public static Bitmap addColorFilter(Bitmap originalBitmap, int filterColor, int
         return resultBitmap;
     }
 
+    @Nullable
     @RequiresApi(Build.VERSION_CODES.P)
     private static Bitmap decodeSampledBitmapViaImageDecoder(@NonNull File file, int reqWidth, int reqHeight) {
         try {
@@ -106,6 +107,7 @@ public void onHeaderDecoded(@NonNull ImageDecoder decoder, @NonNull ImageDecoder
      * @param reqHeight Height of the surface where the Bitmap will be drawn on, in pixels.
      * @return decoded bitmap
      */
+    @Nullable
     public static Bitmap decodeSampledBitmapFromFile(String srcPath, int reqWidth, int reqHeight) {
         final var file = new File(srcPath);
         if (!file.exists()) {