rtlwifi: fix a potential NULL pointer dereference
commit 76597628 upstream. In case alloc_workqueue fails, the fix reports the error and returns to avoid NULL pointer dereference. Signed-off-by: Kangjie Lu <kjlu@umn.edu> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
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