Fix smb2.lock.rw-shared with async I/O enabled

[Volker Lendecke]

On Fri, Jul 13, 2012 at 12:44:48PM +0200, Volker Lendecke wrote:
> Attached find a patch for $SUBJECT. Someone who feels
> familiar with the SMB2 server please comment/ack/push it.

Just for the curious: This patch makes autobuild succeed for
me even if I set "aio read size" and "aio write size" to 1
in a separate patch, enabling aio by default. That was not
the case before this patch.

With best regards,

Volker

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