NFSD: Refactor nfsd_file_gc()

Refactor nfsd_file_gc() to use the new list_lru helper.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

fs/nfsd/filecache.c

@@ -492,7 +492,11 @@ nfsd_file_lru_walk_list(struct shrink_control *sc)
 static void
 nfsd_file_gc(void)
 {
-	nfsd_file_lru_walk_list(NULL);
+	LIST_HEAD(dispose);
+
+	list_lru_walk(&nfsd_file_lru, nfsd_file_lru_cb,
+		      &dispose, LONG_MAX);
+	nfsd_file_gc_dispose_list(&dispose);
 }
 
 static void