[U-Boot] Prevent null pointer dereference originating in cmd_pxe.c

[Tom Rini]

On Wed, Sep 25, 2013 at 09:35:30PM -0400, Steven Falco wrote:

> Pass a valid cmdtp into do_tftpb(), do_ext2load(), and do_get_fat(), to avoid
> possible crashes due to null pointer dereferencing.
> 
> Signed-off-by: Steven A. Falco <stevenfalco at gmail.com>

This doesn't apply cleanly, nor with --ignore-whitespace for me.  Can
you please re-check and re-send the patch?  Thanks.

-- 
Tom
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