Avoid some warnings in rdoff/rdf2bin.c
I received some warnings when running make on the head revision of
nasm from git:
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rdf2bin.c: In function 'main':
rdf2bin.c:122: warning: comparison between signed and unsigned
rdf2bin.c:123: warning: comparison between signed and unsigned
rdf2bin.c:124: warning: comparison between signed and unsigned
----
I think these warnings are innocuous and should be safely avoidable
with simple casts (please see attached patch).
* rdoff/rdf2bin.c
(main): cast to size_t for comparison with fwrite return value
Signed-off-by: Bo Borgerson <gigabo@gmail.com>