python310Packages.tensorflow: remove ? null from inputs

pkgs/development/python-modules/tensorflow/default.nix

@@ -18,7 +18,7 @@
 # it would also make the default tensorflow package unfree. See
 # https://groups.google.com/a/tensorflow.org/forum/#!topic/developers/iRCt5m4qUz0
 , cudaSupport ? false, cudaPackages ? {}
-, mklSupport ? false, mkl ? null
+, mklSupport ? false, mkl
 , tensorboardSupport ? true
 # XLA without CUDA is broken
 , xlaSupport ? cudaSupport
@@ -39,8 +39,6 @@ assert cudaSupport -> cudatoolkit != null
 # unsupported combination
 assert ! (stdenv.isDarwin && cudaSupport);
 
-assert mklSupport -> mkl != null;
-
 let
   withTensorboard = (pythonOlder "3.6") || tensorboardSupport;