update size after Renew

update size after Renew

RT #130841

In general code, change this idiom:

    PL_foo_max += size;
    Renew(PL_foo, PL_foo_max, foo_t);

to
    Renew(PL_foo, PL_foo_max + size, foo_t);
    PL_foo_max += size;

so that if Renew dies, PL_foo_max won't be left hanging.