atm: firestream: check the return value of ioremap() in fs_init()
[ Upstream commit d4e26aae ] The function ioremap() in fs_init() can fail, so its return value should be checked. Reported-by: TOTE Robot <oslab@tsinghua.edu.cn> Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>
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