qcacmn: Add null check in qdf_runtime_lock_deinit()

qdf_runtime_lock_deinit() is currently using the lock blindly without
checking if it is null. Add a null check to prevent it from using a
null pointer.

Change-Id: I3aa13c436f3668de7b1070c2c40bc69c7a4cc9fc
CRs-Fixed: 2642914

qdf/linux/src/qdf_lock.c

@@ -580,6 +580,10 @@ qdf_export_symbol(__qdf_runtime_lock_init);
 void qdf_runtime_lock_deinit(qdf_runtime_lock_t *lock)
 {
 	void *hif_ctx = cds_get_context(QDF_MODULE_ID_HIF);
+
+	if (!lock)
+		return;
+
 	hif_runtime_lock_deinit(hif_ctx, lock->lock);
 }
 qdf_export_symbol(qdf_runtime_lock_deinit);