CVE-2021-46994

In the Linux kernel, the following vulnerability has been resolved: can:
mcp251x: fix resume from sleep before interface was brought up Since
8ce8c0abcba3 the driver queues work via priv->restart_work when resuming
after suspend, even when the interface was not previously enabled. This
causes a null dereference error as the workqueue is only allocated and
initialized in mcp251x_open(). To fix this we move the workqueue init to
mcp251x_can_probe() as there is no reason to do it later and repeat it
whenever mcp251x_open() is called. [mkl: fix error handling in
mcp251x_stop()]