GH-733: Fix SftpRemotePathChannel.transferTo#734
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Give the SftpInputStreamAsync a logical file size larger than the current position transfer is requested to start at. If the user calls transferTo(position, count, output), the logical file size for the SftpInputStreamAsync should be (position + count). It's no problem if that is larger than the real file size, it'll just produce an EOF return. Also guard against NPE in SftpInputStreamAsync in case the initial position is beyond the alleged file size.
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Give the SftpInputStreamAsync a logical file size larger than the current position transfer is requested to start at. If the user calls transferTo(position, count, output), the logical file size for the SftpInputStreamAsync should be (position + count). It's no problem if that is larger than the real file size, it'll just produce an EOF return.
Also guard against NPE in SftpInputStreamAsync in case the initial position is beyond the alleged file size.
Fixes #733.