parser: fix assignment ambiguity (#913)
parser: fix assignment ambiguity (#913)

I doubt this is causing a problem, but in C, a=-1 is ambiguous
and produces a warning on 'indent' or 'lint'.

Signed-off-by: Don Bowman <1f1e67e5fdb25d2e5cd18ddc0fee425272daab56@agilicus.com>
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