gh-152635: Raise MemoryError when the lock allocation fails in `_interpchannels.creat...

gh-152635: Raise MemoryError when the lock allocation fails in `_interpchannels.create()` (#152642)

Previously, an allocation failure when creating
the lock for a channel in `_interpchannels` would trigger an assert.
Caused by `handle_channel_error` being passed an error code of -1
which is only allowed if an exception has been set.
(in this case, no exception was set)

`channelsmod_create` now forwards the error code from `channel_create`
which `handle_channel_error` already handled.

Co-authored-by: sobolevn <mail@sobolevn.me>