Marc Dionne discovered a NULL pointer dereference when setting
SO_REUSEPORT on a socket after it is bound.
This patch removes the assumption that at least one socket in the
reuseport group is bound with the SO_REUSEPORT option before other
bind calls occur.

Fixes: e32ea7e7 ("soreuseport: fast reuseport UDP socket selection")
Reported-by: NMarc Dionne <marc.c.dionne@gmail.com>
Signed-off-by: NCraig Gallek <kraig@google.com>
Tested-by: NMarc Dionne <marc.dionne@auristor.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>