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checkpatch: usb_free_urb() can take NULL
Greg Kroah-Hartman authored

usb_free_urb() can take a NULL, so let's check and warn about that.
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: default avatarAndy Whitcroft <apw@shadowen.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
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