soreuseport: Cleanup duplicate initialization of more_reuse->max_socks.

reuseport_grow() does not need to initialize the more_reuse->max_socks
again. It is already initialized in __reuseport_alloc().

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>