usb: gadget: f_midi: unlock on error
We added some new locking here, but missed an error path where we need to unlock. Fixes: 9acdf4df ('usb: gadget: f_midi: added spinlock on transmit function') Acked-by: NMichal Nazarewicz <mina86@mina86.com> Acked-by: NFelipe F. Tonello <eu@felipetonello.com> Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com> Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>
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