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Added implementation for case target_sbc == 0. In that case, the function shall schedule a wait until all pending swaps for the drawable have completed. Fix for non-blocking case. Old implementation returned random, uninitialized values for (ust,msc,sbc) if it returned immediately without scheduling a wait due to sbc >= target_sbc. Now if function doesn't schedule a wait, but returns immediately, it returns the (ust,msc,sbc) of the most recently completed swap, i.e., the UST and MSC corresponding to the time when the returned current SBC was reached. Signed-off-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>