usb: gadget: f_midi: stash substream in gmidi_in_port structure
For every in_substream, there must be a corresponding gmidi_in_port structure so it is perfectly viable and some might argue sensible to stash pointer to the input substream in the gmidi_in_port structure. This has an added benefit that if in_ports < MAX_PORTS, the whole f_midi structure takes up less space because only in_ports number of pointers for in_substream are allocated instead of MAX_PORTS lots of them. Signed-off-by: NMichal Nazarewicz <mina86@mina86.com> Signed-off-by: NFelipe Balbi <balbi@kernel.org>
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