Merge branch 'ipv6-fixes-for-the-multicast-routes'

Matteo Croce says:

====================
ipv6: fixes for the multicast routes

Fix two wrong flags in the IPv6 multicast routes created
by the autoconf code.
====================

Link: https://lore.kernel.org/r/20210115184209.78611-1-mcroce@linux.microsoft.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>