more trivial ->iterate_shared conversions

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/qnx4/dir.c

@@ -71,7 +71,7 @@ const struct file_operations qnx4_dir_operations =
 {
 	.llseek		= generic_file_llseek,
 	.read		= generic_read_dir,
-	.iterate	= qnx4_readdir,
+	.iterate_shared	= qnx4_readdir,
 	.fsync		= generic_file_fsync,
 };