[mythtv] Patch for "fixme" in NuppelVideoRecorder.cpp

[rob]

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Here's a patch to fix the block of code in NuppelVideoRecorder.cpp that 
has the comment "count free buffers -- FIXME this can be done with less 
CPU time!!"  It just adds a member variable to the class that keeps 
track of the free buffers, instead of counting them in the loop every 
time in the function.


Also, in what case(s) is it necessary to have the thread for writing 
data to the disk (ThreadedFileWriter)?  The implementation is a ring 
buffer that has data added when Write() is called, then sending that 
data to the disk in another thread.  Doesn't the write() system call 
just dump the data to kernel buffers, where it is written when it can 
be?  The extra thread and memcpy's to implement the ring buffer stuff 
may not be necessary.  I didn't notice any difference in performance 
when I removed all of the ThreadedFileWriter code and just had system 
write() calls.

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