inet: frags: change inet_frags_init_net() return value

We will soon initialize one rhashtable per struct netns_frags
in inet_frags_init_net().

This patch changes the return value to eventually propagate an
error.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 787bea77)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>