sfc: remove incorrect EFX_BUG_ON_PARANOID check
write_count and insert_count can wrap around, making > check invalid.
Fixes: 70b33fb0ddec827cbbd14cdc664fc27b2ef4a6b6 ("sfc: add support for
skb->xmit_more").
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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