Commit 229455bc02b87f7128f190c4491b4ceffff38648 accidentally changed the
separator between sed `s' command and its parameters from ':' to '/'.

Revert this change.
Reported-and-tested-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NClement Chauplannaz <chauplac@gmail.com>
Signed-off-by: NMichal Marek <mmarek@suse.cz>