ipmi_si: remove an unused variable in try_smi_init()

The "init_name" variable isn't used any more after commit 90b2d4f1
("ipmi_si: Remove hacks for adding a dummy platform devices").

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Message-Id: <20190322065426.GB12551@kadam>
Signed-off-by: Corey Minyard <cminyard@mvista.com>