Handle -NLE_AGAIN in nl_cache_mngr_data_ready
Since commit "nl: Return -NLE_AGAIN if non-blocking socket would block",
nl_cache_mngr_data_ready returns -NLE_AGAIN to callers on non-blocking sockets.
Change it to consider -NLE_AGAIN as a non-error case as it is expected behavior
with the nl_recv changes.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
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