Revert "usb: gadget: f_rndis: Refactor bind path to use __free()"

This reverts commit 5f65c8ad which is
commit 08228941 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I59c4ff2b2913666549724999edf88fe9fe4204e7
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>