Padding byte in cifs readx response

[Christof Schmitt]

It was pointed out to me that a padding byte in the readx response is
missing:

http://msdn.microsoft.com/en-us/library/ee441872.aspx
 Pad (1 byte): This field is optional. When using the NT LAN Manager
dialect, this field can be used to align the Data field to a 16-bit
boundary relative to the start of the SMB Header. If Unicode strings are
being used, this field MUST be present. When used, this field MUST be
one padding byte long.

I wrote a simple test for this, and it succeeds against a Windows 7 and
fails in
make test TESTS=raw.read

UNEXPECTED(failure): samba3.raw.read.readx(s3dc)
REASON: _StringException: _StringException:
../source4/torture/raw/read.c:441: data not 16 bit aligned
envlog: SMBD LOG of: LOCALS3DC2

Christof