Bluetooth: Don't force DISCOVERY_STOPPED state in inquiry_cache_flush

We are not supposed to force DISCOVERY_STOPPED in inquiry_cache_flush
because we may break the discovery state machine. For instance, during
interleaved discovery, when we are about to start inquiry, the state
machine forcibly goes to DISCOVERY_STOPPED while it should stay in
DISCOVERY_FINDING state.

This problem results in unexpected behaviors such as sending two
mgmt_discovering events to userspace (when only one event is expected)
and Stop Discovery failures.

Signed-off-by: Andre Guedes <andre.guedes@openbossa.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

net/bluetooth/hci_core.c

@@ -413,7 +413,6 @@ static void inquiry_cache_flush(struct hci_dev *hdev)
 
 	INIT_LIST_HEAD(&cache->unknown);
 	INIT_LIST_HEAD(&cache->resolve);
-	cache->state = DISCOVERY_STOPPED;
 }
 
 struct inquiry_entry *hci_inquiry_cache_lookup(struct hci_dev *hdev, bdaddr_t *bdaddr)