Remove the now-redundant (and incorrect) branch from

handle_channel_error

Tested locally with:

    def test_lock_allocation_failure(self):
        import _testcapi

        for n in range(0, 100):
            cid = None
            try:
                _testcapi.set_nomemory(n, n+1)
                cid = _channels.create()
            except MemoryError:
                pass
            finally:
                _testcapi.remove_mem_hooks()
                if cid is not None:
                    _channels.close(cid, force=True)
                    _channels.destroy(cid)

Author: stestagg

Modules/_interpchannelsmodule.c

@@ -427,9 +427,6 @@ handle_channel_error(int err, PyObject *mod, int64_t cid)
                      "if not empty (try force=True)",
                      cid);
     }
-    else if (err == ERR_CHANNEL_MUTEX_ALLOC_FAIL) {
-        PyErr_NoMemory();
-    }
     else if (err == ERR_CHANNELS_MUTEX_INIT) {
         PyErr_SetString(state->ChannelError,
                         "can't initialize mutex for channel management");