kill f_dentry uses

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index d19f199..d116ca8 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -753,7 +753,7 @@
 		 */
 		fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
 
-	cifs_prime_dcache(file->f_dentry, &name, &fattr);
+	cifs_prime_dcache(file->f_path.dentry, &name, &fattr);
 
 	ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
 	return !dir_emit(ctx, name.name, name.len, ino, fattr.cf_dtype);