Merge branch 'ipv6-frags-adopt-__in6_dev_stats_get-a-bit-more'

Eric Dumazet says:

====================
ipv6: frags: adopt __in6_dev_stats_get() a bit more

First patch addresses Sashiko's feedback about a potential
NULL dereference in __in6_dev_stats_get().

Second patch adopts __in6_dev_stats_get() in net/ipv6/reassembly.c.
====================

Link: https://patch.msgid.link/20260526145529.3587126-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>