David Marchand b86aebcb6f trace: avoid confusion on optarg
Prefer a local name to optarg which is a global symbol from the C library.

Fixes: 8c8066ea6a7b ("trace: add trace mode configuration parameter")

Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Sunil Kumar Kori <skori@marvell.com>
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