usb: gadget: FunctionFS: staticize functions used only in f_fs.c
ffs_alloc_dev and ffs_free_dev are used only in f_fs.c, so make them static. Acked-by: NMichal Nazarewicz <mina86@mina86.com> Signed-off-by: NAndrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: NFelipe Balbi <balbi@ti.com>
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