Fix GCC build fail issue for MdeModulePkg and NetworkPkg.

Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
Reviewed-by: Ouyang Qian <qian.ouyang@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14007 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/Network/Mtftp4Dxe/Mtftp4Driver.c

@@ -328,10 +328,11 @@ ON_ERROR:
 
 **/
 EFI_STATUS
+EFIAPI
 Mtftp4DestroyChildEntryInHandleBuffer (
   IN LIST_ENTRY         *Entry,
   IN VOID               *Context
-)
+  )
 {
   MTFTP4_PROTOCOL               *Instance;
   EFI_SERVICE_BINDING_PROTOCOL  *ServiceBinding;