ofproto: Avoid removing rules from meter lists twice.
Since the meter code was introduced, the oftable_remove_rule() function
(recently renamed oftable_remove_rule__()) has had two blocks of code to
remove a rule from its meter's list of rules that reference that meter.
This commit reduces that to one.
Also modifies oftable_remove_rule__() to maintain the invariant that
'rule' is in a meter's list if and only if
!list_is_empty(&rule->meter_list_node). I don't believe that that fixes
a real bug, but it seems like a good idea.
(This seemed like a serious bug at first, but in fact list_remove() is
idempotent: calling it two times in a row has the same effect as calling
it once.)
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Jarno Rajahalme <jrajahalme@nicira.com>