Add NULL check before using t->mbuf_pool.

Fixes: 6f1b828 ("event/dlb2: add self-tests")
Coverity issue: 363719
Cc: sta...@dpdk.org

Signed-off-by: Timothy McDaniel <timothy.mcdan...@intel.com>
---
 drivers/event/dlb2/dlb2_selftest.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/event/dlb2/dlb2_selftest.c 
b/drivers/event/dlb2/dlb2_selftest.c
index e300067..f433654 100644
--- a/drivers/event/dlb2/dlb2_selftest.c
+++ b/drivers/event/dlb2/dlb2_selftest.c
@@ -212,7 +212,12 @@ test_stop_flush(struct test *t) /* test to check we can 
properly flush events */
                goto err;
        }
 
-       count = rte_mempool_avail_count(t->mbuf_pool);
+       if (t->mbuf_pool)
+               count = rte_mempool_avail_count(t->mbuf_pool);
+       else {
+               printf("%d: mbuf_pool is NULL\n", __LINE__);
+               goto err;
+       }
 
        if (rte_event_port_attr_get(evdev,
                                    0,
-- 
2.6.4

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