The compute_score functions are a bit difficult to read.

Neaten them a bit to reduce object sizes and make them a
bit more intelligible.

Return early to avoid indentation and avoid unnecessary
initializations.

(allyesconfig, but w/ -O2 and no profiling)

$ size net/ipv[46]/udp.o.*
   text    data     bss     dec     hex filename
  28680    1184      25   29889    74c1 net/ipv4/udp.o.new
  28756    1184      25   29965    750d net/ipv4/udp.o.old
  17600    1010       2   18612    48b4 net/ipv6/udp.o.new
  17632    1010       2   18644    48d4 net/ipv6/udp.o.old
Signed-off-by: NJoe Perches <joe@perches.com>
Acked-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>