Minor fix to the QR

examples/test_qr.c

@@ -571,7 +571,7 @@ void test_qr(int m, int n, int K, int nr_threads, int runs, double* matrix) {
       tid_new = qsched_addtask(&s, task_DTSQRF, task_flag_none, data,
                                sizeof(int) * 3, 3);
       qsched_addlock(&s, tid_new, rid[k * m + i]);
-      qsched_adduse(&s, tid_new, rid[k * m + k]);
+      qsched_addlock(&s, tid_new, rid[k * m + k]);
       qsched_addunlock(&s, tid[k * m + (i - 1)], tid_new);
       if (tid[k * m + i] != -1) qsched_addunlock(&s, tid[k * m + i], tid_new);
       tid[k * m + i] = tid_new;