small fix to avoid a 20 seconds deadlock (thread starving whe ncalling set_channel)
small fix to avoid a 20 seconds deadlock (thread starving whe ncalling set_channel)

jeanleflambeur/silkopter,jeanleflambeur/silkopter,jeanleflambeur/silkopter,jeanleflambeur/silkopter,jeanleflambeur/silkopter,jeanleflambeur/silkopter,jeanleflambeur/silkopter