This patch fixes (dereference after null check) coverity issue.
For this reason, we should add null check at the beginning of the
function and return error directly if the 'intr_handle' is null.
Coverity issue: 357695, 357751
Fixes: 05c4105738 ("trace: add interrupt tracepoints")
Cc: stable@dpdk.org
Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
Reviewed-by: Harman Kalra <hkalra@marvell.com>
39e2961a09