add missing braces around FOR_EACH_PTR loop

Stricto sensu, these braces are not needed but are used
everywhere else around FOR_EACH_PTR and friends loops.
Their lack can also bite you when doing experiments with
the ptrlist macros ...

CC: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Signed-off-by: Christopher Li <sparse@chrisli.org>
1 file changed