[PATCH] IPV6: ipv6_fl_socklist is inadvertently shared.

[PATCH] IPV6: ipv6_fl_socklist is inadvertently shared.

Backport from 2.6. Original patch from Masayuki Nakagawa, with
his description below :

"
 The ipv6_fl_socklist from listening socket is inadvertently shared
 with new socket created for connection.  This leads to a variety of
 interesting, but fatal, bugs. For example, removing one of the
 sockets may lead to the other socket's encountering a page fault
 when the now freed list is referenced.

 The fix is to not share the flow label list with the new socket.
"

original patch:
   Signed-off-by: Masayuki Nakagawa <nakagawa.msy@ncos.nec.co.jp>
Signed-off-by: Willy Tarreau <w@1wt.eu>