[IPV6] ADDRCONF: Convert ipv6_get_saddr() to ipv6_dev_get_saddr().

Since most users of ipv6_get_saddr() pass non-NULL as
dst argument, use ipv6_dev_get_saddr() directly.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

diff --cc include/net/addrconf.h
Simple merge

diff --cc net/ipv6/addrconf.c
Simple merge

diff --cc net/ipv6/fib6_rules.c
Simple merge

diff --cc net/ipv6/ip6_output.c
Simple merge

diff --cc net/ipv6/route.c
Simple merge

diff --cc net/ipv6/xfrm6_policy.c
Simple merge

diff --cc net/sctp/ipv6.c
Simple merge