[U-Boot] TFTP - check for len == 0 before storing

[Detlev Zundel]

Hi David,

> I had a problem with an old TFTP Server which is sending a second "last"
> data block with "len == 0" at end. It's clearly not RFC conform, but I
> still made a additional check in u-boot/tftp to avoid a wrong "filesize"
> value. This wrong filesize value caused some trouble by NAND operations.

Please look at our patch guidelines[1] on how to submit patches.
Especially a signed-off-by is missing on this patch.

Moreover, please put the explanation into the commit log so that one can
learn the rationale for the change when studying the source with git.

Thanks
  Detlev

[1] http://www.denx.de/wiki/U-Boot/Patches

-- 
LISP has  jokingly been  described as  "the most  intelligent way to  misuse a
computer".  I think that  description a great  compliment because it transmits
the full  flavour of  liberation:  it has assisted a number of our most gifted
fellow humans in thinking previously impossible thoughts. - Edsger W. Dijkstra
--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: dzu at denx.de