tty: Fix leak in ti-usb
If the ti-usb adapter returns an zero data length frame (which happens) then we leak a kref. Found by Christoph Mair <christoph.mair@gmail.com> who proposed a patch. The patch here is different as Christoph's patch didn't work for the case where tty = NULL and data arrived but Christoph did all the hard work chasing it down. Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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