UPSTREAM: net/ipv6: fix bool/int mismatch for skip_notify_on_dev_down

[ Upstream commit edf2e1d2 ]

skip_notify_on_dev_down ctl table expects this field
to be an int (4 bytes), not a bool (1 byte).

Because proc_dou8vec_minmax() was added in 5.13,
this patch converts skip_notify_on_dev_down to an int.

Following patch then converts the field to u8 and use proc_dou8vec_minmax().

Fixes: 7c6bb7d2 ("net/ipv6: Add knob to skip DELROUTE message on device down")
Change-Id: I99875fad5012906099456fafa88e42e7f02133cf
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Acked-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 76e38e6e)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>