trace: remove string duplication
trace: remove string duplication

No need to duplicate an untouched string.

Signed-off-by: David Marchand <f28529695cfa9e3e1eb84e7072aa626af4abb18e@redhat.com>
Acked-by: Sunil Kumar Kori <bdee174bc83e2fb76d979ba14c67b948a0d67de5@marvell.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk