[U-Boot-Users] patch to tftp.c

[Josh Fryman]

this patch for "tftp.c" fixes a logical error in the prior implementation
supporting direct-tftp-to-flash.  this puts in some additional safety 
checks to make sure you don't cross a flash boundary during the course of
a write.  

this will catch such actions before starting, and complain verbosely about
what the actual problem is.

-josh
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