test/dma: fix stats tear down

The API testsuite previously only used the dmadev skeleton. Now that real
devices are being used for the API tests, the DMA stats need to be reset
during testsuite teardown to ensure a known, clean state before continuing.

Fixes: 14b477e ("test/dma: use unit test framework")

Signed-off-by: Kevin Laatz <kevin.laatz@intel.com>
Acked-by: Chengwen Feng <fengchengwen@huawei.com>

app/test/test_dmadev_api.c

@@ -82,6 +82,7 @@ testsuite_teardown(void)
 	dst = NULL;
 	/* Ensure the dmadev is stopped. */
 	rte_dma_stop(test_dev_id);
+	rte_dma_stats_reset(test_dev_id, RTE_DMA_ALL_VCHAN);
 
 	rte_log_set_level_pattern("lib.dmadev", RTE_LOG_INFO);
 }