eventdev/eth_rx: fix parameters parsing memory leak

eventdev/eth_rx: fix parameters parsing memory leak

The memory get from strdup should be freed when parameter parsing
finished, and also should be freed when error occurs.

Fixes: 814d01709328 ("eventdev/eth_rx: support telemetry")
Fixes: 9e583185318f ("eventdev/eth_rx: support telemetry")
Cc: stable@dpdk.org
Signed-off-by: Weiguo Li <liwg06@foxmail.com>
Acked-by: Ganapati Kundapura <ganapati.kundapura@intel.com>
Acked-by: Jay Jayatheerthan <jay.jayatheerthan@intel.com>