wifi: iwl4965: Add missing check for create_singlethread_workqueue()

wifi: iwl4965: Add missing check for create_singlethread_workqueue()

[ Upstream commit 423cf0de5d1b853dcadfada3a0998b20134ca5ff ]

Add the check for the return value of the create_singlethread_workqueue()
in order to avoid NULL pointer dereference.

Fixes: f71f97212c63 ("[IWLWIFI]: add iwlwifi wireless drivers")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Acked-by: Stanislaw Gruszka <stf_xl@wp.pl>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230209010748.45454-1-jiasheng@iscas.ac.cn
Signed-off-by: Sasha Levin <sashal@kernel.org>