qcacld-3.0: Ignore invalid flush work call in hdd_mic_flush_work

As per current implementation, hdd_mic_flush_work makes a call
to qdf_flush_work irrespective of whether the work is initialized
or not.

Since flush_work() without INIT_WORK() is erroneous, ignore the call
to flush_work if work is not initialized.

Change-Id: Ib96439e1416188e643935a4ddaa13671d221c1e2
CRs-Fixed: 2514424
1 file changed