When TFTP tries to open a file, it is expecting struct open_file member f_devdata to be a pointer to a socket number.  When currdev is "pxe", that assumption is correct.  When currdev is "disk*", that assumption is incorrect.
When TFTP tries to open a file, it is expecting struct open_file
member f_devdata to be a pointer to a socket number.  When currdev
is "pxe", that assumption is correct.  When currdev is "disk*", that
assumption is incorrect.

Submitted by:	Jim Browne <jbrowne@jbrowne.com>

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