i40e: avoid null pointer dereference
In function i40e_debug_aq parameter desc is assumed to be possibly NULL. Do not dereference it before checking the value. Fixes: f905dd62 ("i40e/i40evf: add max buf len to aq debug print helper") Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Tested-by: Andrew Bowers <andrewx.bowers@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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