[syslinux] patch to deal with empty filenames

[H. Peter Anvin]

Kevin D. Clark wrote:
> 
> Sorry, you are incorrect.
> 
> The original code never allows you to use the regular expression
> remapping feature for this particular case (I tried this first).
> 
> The original code is written such that an empty filename causes most
> of the while-statement in tftpd/tftpd.c:739 to be skipped.  After
> this, the following expression is executed:
> 

OK, that's a problem.  I'll probably change it to pass a "" filename on 
unmolested, rather than turning it into an arbitrary string.

	-hpa