[FS#256] usb audio doesn't work - "no such device"

[LEDE Bugs]

The following task has a new comment added:

FS#256 - usb audio doesn't work - "no such device"
User who did this - Mathias Kresin (mkresin)

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I did the compare and the kernel size doesn't increase. As expected the size of the kmod increases.

Dimitry, would you please test the attached patch and report back whether the issue is fixed.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=256#comment777