ipv4: Inline fib_semantic_match into check_leaf

This elimiates a lot of pure overhead due to parameter
passing.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc net/ipv4/fib_lookup.h
Simple merge

diff --cc net/ipv4/fib_semantics.c
Simple merge

diff --cc net/ipv4/fib_trie.c
Simple merge