[pvrusb2] fwextract.pl doesn't recursively search subdirectories

[Mike Isely]

There is a minor issue with fwextract.pl and the documentation supporting 
it.  The fwextract.pl program only searches through the exact directory it 
is told to look into; it will not recurse into subdirectories.  The 
fwextract.pl program is very literal in its interpretation of "the 
directory" it is told to examine.  Honestly it never even occurred to me 
to think about this, but with recent Hauppauge driver packages the files 
you really need to point fwextract.pl are in a subdirectory within the zip 
file.  Thus if you just expand the zip file and point fwextract.pl at its 
top level then it won't find anything.  Instead you need to point 
fwextract.pl inside the extracted tree, at the DriverD2 subdirectory to be 
exact.  The fact that the pvrusb2 documentation says nothing at all about 
nested subdirectories just obfuscates this whole situation.

I'll see about updating the documentation to clarify this and also 
modifying fwextract.pl to either implicitly search any nested 
subdirectories or to at least print a warning / suggestion if it 
encounters a nested subdirectory during its search...

  -Mike

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