examples/ioat: add missed spdk_env_fini() call when exiting

Change-Id: I993d41dbec264fef140c83dcd585231c8d958a97
Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/10908
Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <smatsumoto@nvidia.com>
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>

examples/ioat/perf/perf.c

@@ -590,5 +590,6 @@ cleanup:
 	unregister_workers();
 	ioat_exit();
 
+	spdk_env_fini();
 	return rc;
 }

examples/ioat/verify/verify.c

@@ -518,5 +518,6 @@ cleanup:
 	ioat_exit();
 	free(threads);
 
+	spdk_env_fini();
 	return rc;
 }