thunderbolt: Fix to check for kmemdup failure
Memory allocated via kmemdup might fail and return a NULL pointer. This patch adds a check on the return value of kmemdup and passes the error upstream. Signed-off-by: Aditya Pakki <pakki001@umn.edu> Reviewed-by: Mukesh Ojha <mojha@codeaurora.org> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
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