afs: Get rid of afs_call::reply[]

Replace the afs_call::reply[] array with a bunch of typed members so that
the compiler can use type-checking on them.  It's also easier for the eye
to see what's going on.

Signed-off-by: David Howells <dhowells@redhat.com>

fs/afs/file.c

@@ -408,7 +408,7 @@ static int afs_readpage(struct file *file, struct page *page)
 static void afs_readpages_page_done(struct afs_call *call, struct afs_read *req)
 {
 #ifdef CONFIG_AFS_FSCACHE
-	struct afs_vnode *vnode = call->reply[0];
+	struct afs_vnode *vnode = call->xvnode;
 #endif
 	struct page *page = req->pages[req->index];