Splice: splice_direct_to_actor() and randomly data drop

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Seeing implementation of  splice_direct_to_actor(), I decide, that
"random data drop" can appear if we alrady have done splice_to, but
have problems with splice_from.

1. Why not to use tee() instead of splice_to ? and after all
operations copmleted successfully, just consume data from IN to
/dev/null :) anyhow.

It will allow to splice between ANY file descriptors, not between
"regular file/block device" and ANY.

2. After that, in do_splice we might call do_splice_direct() if both
file descriptors are not pipe.

-- 
Segmentation fault
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