usb: gadget: f_midi: Annotate struct f_midi with __counted_by

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct f_midi.
Additionally, since the element count member must be set before accessing
the annotated flexible array member, move its initialization earlier.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Greg Kroah-Hartman <[email protected]>
Cc: John Keeping <[email protected]>
Cc: Peter Chen <[email protected]>
Cc: Hulk Robot <[email protected]>
Cc: Allen Pais <[email protected]>
Cc: Will McVicker <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Zhang Qilong <[email protected]>
Cc: [email protected]
Reviewed-by: "Gustavo A. R. Silva" <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Kees Cook <[email protected]>

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