nfs: replace strict_strto* with kstrto*

[nfs] replace strict_str* with kstr* variants

 * replace string conversions with newer kstr* functions

Signed-off-by: Daniel Walter <sahne@0x90.at>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2 files changed