afs: Fix afs_init_request() to handle getting no file* from writepages

fs/afs/file.c

diff --git a/fs/afs/file.c b/fs/afs/file.c
index 42ab2b2..9072b55 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -350,7 +350,7 @@ static int afs_symlink_readpage(struct file *file, struct page *page)
 
 static int afs_init_request(struct netfs_io_request *rreq, struct file *file)
 {
-	rreq->netfs_priv = key_get(afs_file_key(file));
+	//rreq->netfs_priv = key_get(afs_file_key(file));
 	rreq->rsize = 4 * 1024 * 1024;
 	rreq->wsize = 16 * 1024 * 1024; // 0x33333;
 	return 0;