ssh_channel_write() and SSH_AGAIN

[Vic Lee <llyzs@xxxxxxx>]

Hi libssh team!

Recently I am having a problem when migrating to 0.5. Previously in 0.4 
when I call channel_write() libssh will block until the packet has 
actually sent out (i.e. blocking_flush). However in 0.5 I saw that the 
blocking flush has been remove and replaced by nonblocking_flush. And 
when I call ssh_channel_write() it returns SSH_AGAIN. What should I do 
in the application after I receive this rc? I can't find an API that 
could force a flush, and the next ssh_channel_select does not flush 
anything either.

Thanks!

Vic