ipmi:ssif: Add check for kstrdup

[ Upstream commit c5586d0f711e9744d0cade39b0c4a2d116a333ca ]

Add check for the return value of kstrdup() and return the error
if it fails in order to avoid NULL pointer dereference.

Fixes: c4436c91 ("ipmi_ssif: avoid registering duplicate ssif interface")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Message-Id: <20230619092802.35384-1-jiasheng@iscas.ac.cn>
Signed-off-by: Corey Minyard <minyard@acm.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>