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Fix typo/spello of "function".
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: linux-usb@vger.kernel.org
Cc: Jiri Kosina <trivial@kernel.org>
Signed-off-by: Felipe Balbi <balbi@kernel.org>