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usb_free_coherent() is safe with NULL addr and this check is not required. Signed-off-by: Xu Wang <vulab@iscas.ac.cn> Link: https://lore.kernel.org/r/20200727025208.8739-1-vulab@iscas.ac.cn Signed-off-by: Takashi Iwai <tiwai@suse.de>