multi_usrp: Provide valid return value for multi_usrp::get_device()

For RFNoC devices, multi_usrp::get_device() no longer returns a device
pointer, rather, it returns a nullptr.
This is intentional because access to the underlying device is no longer
allowed. However, legacy code can segfault (e.g. portions ofr gr-uhd).

This patch returns a faux uhd::device class, which almost mimicks the
original behaviour perfectly, by redirecting its class methods back to
multi_usrp_rfnoc. The only exception is recv_async_msg(), which requires
a TX streamer. This function will always return false now.

0 files changed, 0 insertions, 0 deletions