Fix flash attention #514
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Fix flash attention #514
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fa3 latest version changed the return shape of the varlen func to be consistent w fa2. this pr fixes the fa3 attention call as done in Wan-Video/Wan2.2#64
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fa3 latest version changed the return shape of the varlen func to be consistent w fa2. this pr fixes the fa3 attention call as done in Wan-Video/Wan2.2#64