omx_core: fix heap corruption when unregistering component

Change-Id: Ie5c20e48f376054b1fe468274128e4c19c2ef3d1

exynos/multimedia/openmax/core/SEC_OMX_Component_Register.c

@@ -141,8 +141,10 @@ OMX_ERRORTYPE SEC_OMX_Component_Unregister(SEC_OMX_COMPONENT_REGLIST *componentL
 {
     OMX_ERRORTYPE ret = OMX_ErrorNone;
 
+    if (componentList != NULL) {
         SEC_OSAL_Memset(componentList, 0, sizeof(SEC_OMX_COMPONENT_REGLIST) * MAX_OMX_COMPONENT_NUM);
         SEC_OSAL_Free(componentList);
+    }
 
 EXIT:
     return ret;