ipmi: Fix some kernel-doc warnings

The current code provokes some kernel-doc warnings:
	drivers/char/ipmi/ipmi_msghandler.c:618: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
Signed-off-by: Bo Liu <liubo03@inspur.com>
Message-Id: <20221025060436.4372-1-liubo03@inspur.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>

drivers/char/ipmi/ipmi_msghandler.c

@@ -614,7 +614,7 @@ static int __ipmi_bmc_register(struct ipmi_smi *intf,
 static int __scan_channels(struct ipmi_smi *intf, struct ipmi_device_id *id);
 
 
-/**
+/*
  * The driver model view of the IPMI messaging driver.
  */
 static struct platform_driver ipmidriver = {