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devm_kasprintf() returns a pointer to dynamically allocated memory which can be NULL upon failure. Fixes: 05bd97fc559d ("net: dsa: Add Vitesse VSC73xx DSA router driver") Signed-off-by: Kunwu Chan <chentao@kylinos.cn> Suggested-by: Jakub Kicinski <kuba@kernel.org> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://lore.kernel.org/r/20240111072018.75971-1-chentao@kylinos.cn Signed-off-by: Jakub Kicinski <kuba@kernel.org>