[Simh] Warning when compiling with Intel C

[Nelson H. F. Beebe]

>> else if ((c = '%') && (val > 0) && (val < 100))

If this is not a test for c being a percent sign, then it is better
to code it as a comma expression:

	else if ((c = '%', c) && ... )

That way, it is clear to the reader, and the compiler, that the
value tested is the character itself, not the result of an equality
test.

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