nfsd: use cache detail pointer from svc_export structure on cache put

Hard-coded pointer is redundant now and can be replaced.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/include/linux/nfsd/export.h b/include/linux/nfsd/export.h
index 6445529..485c2af 100644
--- a/include/linux/nfsd/export.h
+++ b/include/linux/nfsd/export.h
@@ -147,7 +147,7 @@
 
 static inline void exp_put(struct svc_export *exp)
 {
-	cache_put(&exp->h, &svc_export_cache);
+	cache_put(&exp->h, exp->cd);
 }
 
 static inline void exp_get(struct svc_export *exp)