Bluetooth: Prevent unintended pause by checking if advertising is active

[ Upstream commit 1f029b4e ]

When PA Create Sync is enabled, advertising resumes unexpectedly.
Therefore, it's necessary to check whether advertising is currently
active before attempting to pause it.

  < HCI Command: LE Add Device To... (0x08|0x0011) plen 7  #1345 [hci0] 48.306205
  		Address type: Random (0x01)
  		Address: 4F:84:84:5F:88:17 (Resolvable)
  		Identity type: Random (0x01)
  		Identity: FC:5B:8C:F7:5D:FB (Static)
  < HCI Command: LE Set Address Re.. (0x08|0x002d) plen 1  #1347 [hci0] 48.308023
  		Address resolution: Enabled (0x01)
  ...
  < HCI Command: LE Set Extended A.. (0x08|0x0039) plen 6  #1349 [hci0] 48.309650
  		Extended advertising: Enabled (0x01)
  		Number of sets: 1 (0x01)
  		Entry 0
  		Handle: 0x01
  		Duration: 0 ms (0x00)
  		Max ext adv events: 0
  ...
  < HCI Command: LE Periodic Adve.. (0x08|0x0044) plen 14  #1355 [hci0] 48.314575
  		Options: 0x0000
  		Use advertising SID, Advertiser Address Type and address
  		Reporting initially enabled
  		SID: 0x02
  		Adv address type: Random (0x01)
  		Adv address: 4F:84:84:5F:88:17 (Resolvable)
  		Identity type: Random (0x01)
  		Identity: FC:5B:8C:F7:5D:FB (Static)
  		Skip: 0x0000
  		Sync timeout: 20000 msec (0x07d0)
  		Sync CTE type: 0x0000

Fixes: ad383c2c ("Bluetooth: hci_sync: Enable advertising when LL privacy is enabled")
Signed-off-by: Yang Li <yang.li@amlogic.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>