usb: gadget: printer: don't access file global pnp_string in function's code
In order to factor out a reusable f_printer, the function's code should not use file global variables related to legacy printer gadget's implementation. Signed-off-by:Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by:
Felipe Balbi <balbi@ti.com>
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