The variable 'have_mirror_tarballs' is used as a boolean while it is
actually the result of 'd.getVar('BB_GENERATE_MIRROR_TARBALLS')' and
thus a string.
Fix this by converting it into a boolean before using i
t.
(From OE-Core rev: f6185d51b84d8d2eb578dbd322c1c61537efabf6)
Signed-off-by: Enrico Jörns <ejo@pengutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>