Unequal balancing on bonds with links down

Hi!

When a bond has one of its members down, the balancing becomes unequal. 
For example, a four-member bond with the first member down, all the 
traffic that should have been sent to this first member is sent to the 
next one. This may be a lot of additional traffic for one interface. 
This applies for both balance-xor and balance-rr. For balance-xor, the 
hash could be computed modulo the number of active interfaces. For 
balance-rr, inactive interfaces could be skipped. Is there some reason 
that selection of TX interface is not done this way? If there is none, I 
may come with a patch for this.