ipmi: Fix failure on SMBIOS specified devices

An extra memset was put into a place that cleared the interface
type.
Reported-by: NTony Camuso <tcamuso@redhat.com>
Fixes: 3cd83bac ("ipmi: Consolidate the adding of platform devices")
Signed-off-by: NCorey Minyard <cminyard@mvista.com>

drivers/char/ipmi/ipmi_dmi.c

@@ -66,7 +66,6 @@ static void __init dmi_add_platform_ipmi(unsigned long base_addr,
 		return;
 	}
 
-	memset(&p, 0, sizeof(p));
 	p.addr = base_addr;
 	p.space = space;
 	p.regspacing = offset;