Fixes memory leaks detected by Coverity. These are due to ephemeral
memory allocations not being freed when errors occur.
Coverity issue: 127349
Fixes: e2aae1c1ced9 ("ethdev: remove name from extended statistic fetch")
Signed-off-by: Remy Horton <remy.horton@intel.com>
9f2bb5ce8a