Use do_each_thread as a proper do/while block.  Sparse complained.
Signed-off-by: James Morris <jmorris@namei.org>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
                        struct task_struct *g, *t;
                        struct mm_struct *mm = p->mm;
                        read_lock(&tasklist_lock);
-                       do_each_thread(g, t)
+                       do_each_thread(g, t) {
                                if (t->mm == mm && t != p) {
                                        read_unlock(&tasklist_lock);
                                        return -EPERM;
                                }
-                       while_each_thread(g, t);
+                       } while_each_thread(g, t);
                        read_unlock(&tasklist_lock);
                }