Update app.py

app.py

@@ -141,7 +141,7 @@ def decode_doc(passw,doc=None):
     return dec_file
 
 def decode_qr(im,passw):
-    with open(f'{img}', "rb") as image_file:
+    with open(f'{im}', "rb") as image_file:
         bytes_i = base64.b64encode(image_file.read())     
     decode_qr = stegan.decode(bytes_i)