usb: gadget: return the right length in ffs_epfile_io()
When the request length is aligned to maxpacketsize, sometimes
the return length ret > the user space requested len.
At that time, we will use min_t(size_t, ret, len) to limit the
size in case of user data buffer overflow.
But we need return the min_t(size_t, ret, len) to tell the user
space rightly also.
[ balbi@ti.com: also fix comment's indentation ]
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Reviewed-by: David Cohen <david.a.cohen@linux.intel.com>
Signed-off-by: Chuansheng Liu <chuansheng.liu@intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
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