b43: fix invalid memory access in b43_ssb_remove()
wldev is freed in b43_one_core_detach() and should not be accessed after that call. Keep wldev->dev in a local variable. Signed-off-by: NPavel Roskin <proski@gnu.org> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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