remove IPMI_CC_OK

Since IPMI_CC_OK declared in api.h has been gradually deprecated,
this submission will use ipmi::ccSuccess in api.hpp instead.

Change-Id: Iabc1e7172b5872a5fc94dad16cb3fcf71ca6cb3c
Signed-off-by: George Liu <liuxiwei@ieisystem.com>
diff --git a/groupext.cpp b/groupext.cpp
index 9578b83..a3a806e 100644
--- a/groupext.cpp
+++ b/groupext.cpp
@@ -10,7 +10,7 @@
                          ipmi_context_t)
 {
     // Generic return from IPMI commands.
-    ipmi_ret_t rc = IPMI_CC_OK;
+    ipmi_ret_t rc = ipmi::ccSuccess;
     uint8_t* p = (uint8_t*)response;
 
     std::printf("IPMI GROUP EXTENSIONS\n");