usb: gadget: printer: factor out f_printer
The legacy printer gadget now contains both a reusable printer function and legacy gadget proper implementations interwoven, but logically separate. This patch factors out a reusable f_printer. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
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