repacketizer_demo: check for read errors to fix compiler warnings
Actually check for read errors instead of just storing the
return value in a variable that then never gets checked.
Also fixes "conversion from 'size_t' to 'int', possible loss
of data" compiler warnings on Windows with MSVC caused by
storing the size_t returned by fread() into an int variable.
Signed-off-by:
Mark Harris <mark.hsj@gmail.com>
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