char:ipmi:Fix spelling mistake "asychronously" -> "asynchronously"

There is a spelling mistake in the comment information. Fix it.
Signed-off-by: Nzipeng zhang <zhangzipeng0@foxmail.com>
Message-Id: <tencent_F0BFF85BC7C1FC84E440A7B7D364D2ED4209@qq.com>
Signed-off-by: NCorey Minyard <cminyard@mvista.com>

drivers/char/ipmi/ipmi_ssif.c

@@ -1283,7 +1283,7 @@ static void ssif_remove(struct i2c_client *client)
 		return;
 
 	/*
-	 * After this point, we won't deliver anything asychronously
+	 * After this point, we won't deliver anything asynchronously
 	 * to the message handler.  We can unregister ourself.
 	 */
 	ipmi_unregister_smi(ssif_info->intf);