[PATCH] Avoid deliberate cleanup when sendfile is not supported

[Anoop C S]

Hi,

Please find the attached patch which handles ENOTSUP when 'use sendfile' is incorrectly configured
for a particular share.

Tested the patch with vfs_glusterfs module and could confirm that this change avoids the
server_cleanup and the resulting error from Windows client (Win 8.1).

Thanks,
--Anoop C S.
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