usb: gadget: loopback: fix: Don't share qlen and buflen between instances
Each instance of loopback function may have different qlen and buflen attributes values. When linking function to configuration those values had been assigned to global variables. Linking other instance to config overwrites those values. This commit moves those values to f_loopback structure to avoid overwriting. Now each function has its own instance of those values. Signed-off-by: NKrzysztof Opasiak <k.opasiak@samsung.com> Reviewed-by: NRobert Baldyga <r.baldyga@samsung.com> Signed-off-by: NFelipe Balbi <balbi@ti.com>
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