Modify respond of un-supported IPMI command

A number of callbacks are registered for 'WILDCARD' types, which
currently do nothing except respond with CC_OK(00h).  Change complete
codes to CC_INVALID(C1h).

Resolves openbmc/openbmc#469.

Change-Id: I91ea5ee1a23284a4159ff1c1867342e89c6fa444
Signed-off-by: Nan Li <william.bjlinan@hotmail.com>
diff --git a/apphandler.cpp b/apphandler.cpp
index 8da85e4..7b64c76 100644
--- a/apphandler.cpp
+++ b/apphandler.cpp
@@ -556,7 +556,7 @@
     printf("Handling WILDCARD Netfn:[0x%X], Cmd:[0x%X]\n",netfn, cmd);
 
     // Status code.
-    ipmi_ret_t rc = IPMI_CC_OK;
+    ipmi_ret_t rc = IPMI_CC_INVALID;
 
     *data_len = strlen("THIS IS WILDCARD");