bug when transferring a tensor to pinned memory

[sebffischer]

Not sure why this happens:

> x = torch_tensor(1, device = torch_device("cpu"))
> x$pin_memory(device = torch_device("cpu"))
Error in (function (self, device)  : 
  Attempted to set the storage of a tensor on device "cpu" to a storage on different device "mps:0".  This is no longer allowed; the devices must match.
Exception raised from checkSetStorage at /Users/runner/work/libtorch-mac-m1/libtorch-mac-m1/pytorch/aten/src/ATen/native/Resize.h:139 (most recent call first):
frame #0: c10::Error::Error(c10::SourceLocation, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>) + 52 (0x10367c11c in libc10.dylib)
frame #1: c10::detail::torchCheckFail(char const*, char const*, unsigned int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&) + 140 (0x103678d6c in libc10.dylib)
frame #2: void at::native::checkSetStorage<long long>(at::Tensor&, c10::Storage, long long, c10::ArrayRef<long long>, c10::ArrayRef<long long>) + 496 (0x153902bec in libtorch_cpu.dylib)
frame #3: at::native::set_storage_cpu_(at::Tensor&, c10::Storage, long long, c10::ArrayRef<long long>, c10::ArrayRef<
> x$pin_memory()
Error in (function (self, device)  : Expected a torch_device
>