qahw_api: Fix for measure KPI latency values test app issue

- To measure KPI latency values, second fclose of fd_latency_node
  in test app causing segmentation fault.
- To fix this, remove double fclose for fd_latency_node.

Change-Id: I2b19d9f18eff7a63074aa01092afb06064f6723b
1 file changed