Solve the problem of RT_USING_DFS cyclic dependency.
@@ -154,7 +154,7 @@ if RT_USING_DFS
config RT_USING_DFS_NFS
bool "Using NFS v3 client file system"
- select RT_USING_LWIP
+ depends on RT_USING_LWIP
default n
if RT_USING_DFS_NFS
