Non NAPI drivers can call skb_tstamp_tx() and then sock_queue_err_skb()
from hard IRQ context.

Therefore, sock_dequeue_err_skb() needs to block hard irq or
corruptions or hangs can happen.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Fixes: 364a9e93 ("sock: deduplicate errqueue dequeue")
Fixes: cb820f8e ("net: Provide a generic socket error queue delivery method for Tx time stamps.")
Signed-off-by: NDavid S. Miller <davem@davemloft.net>