Reduce indentation, add comment

Reduce one level of indentation, and explain why we wait for
physide_dl_tti callback.

radio/fhi_72/oaioran.c

@@ -112,39 +112,42 @@ void oai_xran_fh_rx_callback(void *pCallbackTag, xran_status_t status)
       }
     }
 #endif
-    if (first_call_set) {
-      slot2 = slot + (subframe * slots_per_subframe);
-      rx_RU[ru_id][slot2] = 1;
-      if (last_frame > 0 && frame > 0
-          && ((slot2 > 0 && last_frame != frame) || (slot2 == 0 && last_frame != ((1024 + frame - 1) & 1023))))
-        LOG_E(PHY, "Jump in frame counter last_frame %d => %d, slot %d\n", last_frame, frame, slot2);
-      for (int i = 0; i < num_ports; i++) {
-        if (rx_RU[i][slot2] == 0)
-          return;
-      }
-      for (int i = 0; i < num_ports; i++)
-        rx_RU[i][slot2] = 0;
+    // if xran did not call xran_physide_dl_tti callback, it's not ready yet.
+    // wait till first callback to advance counters, because otherwise users
+    // would see periodic output with only "0" in stats counters
+    if (!first_call_set)
+      return;
+    slot2 = slot + (subframe * slots_per_subframe);
+    rx_RU[ru_id][slot2] = 1;
+    if (last_frame > 0 && frame > 0
+        && ((slot2 > 0 && last_frame != frame) || (slot2 == 0 && last_frame != ((1024 + frame - 1) & 1023))))
+      LOG_E(PHY, "Jump in frame counter last_frame %d => %d, slot %d\n", last_frame, frame, slot2);
+    for (int i = 0; i < num_ports; i++) {
+      if (rx_RU[i][slot2] == 0)
+        return;
+    }
+    for (int i = 0; i < num_ports; i++)
+      rx_RU[i][slot2] = 0;
 
-      if (last_slot == -1 || slot2 != last_slot) {
+    if (last_slot == -1 || slot2 != last_slot) {
 #ifndef USE_POLLING
-        notifiedFIFO_elt_t *req = newNotifiedFIFO_elt(sizeof(oran_sync_info_t), 0, &oran_sync_fifo, NULL);
-        oran_sync_info_t *info = NotifiedFifoData(req);
-        info->tti = tti;
-        info->sl = slot2;
-        info->f = frame;
-        LOG_D(PHY, "Push %d.%d.%d (slot %d, subframe %d,last_slot %d)\n", frame, info->sl, slot, ru_id, subframe, last_slot);
-        pushNotifiedFIFO(&oran_sync_fifo, req);
+      notifiedFIFO_elt_t *req = newNotifiedFIFO_elt(sizeof(oran_sync_info_t), 0, &oran_sync_fifo, NULL);
+      oran_sync_info_t *info = NotifiedFifoData(req);
+      info->tti = tti;
+      info->sl = slot2;
+      info->f = frame;
+      LOG_D(PHY, "Push %d.%d.%d (slot %d, subframe %d,last_slot %d)\n", frame, info->sl, slot, ru_id, subframe, last_slot);
+      pushNotifiedFIFO(&oran_sync_fifo, req);
 #else
-        LOG_D(PHY, "Writing %d.%d.%d (slot %d, subframe %d,last_slot %d)\n", frame, slot2, ru_id, slot, subframe, last_slot);
-        oran_sync_info.tti = tti;
-        oran_sync_info.sl = slot2;
-        oran_sync_info.f = frame;
+      LOG_D(PHY, "Writing %d.%d.%d (slot %d, subframe %d,last_slot %d)\n", frame, slot2, ru_id, slot, subframe, last_slot);
+      oran_sync_info.tti = tti;
+      oran_sync_info.sl = slot2;
+      oran_sync_info.f = frame;
 #endif
-      } else
-        LOG_E(PHY, "Cannot Push %d.%d.%d (slot %d, subframe %d,last_slot %d)\n", frame, slot2, ru_id, slot, subframe, last_slot);
-      last_slot = slot2;
-      last_frame = frame;
-    } // first_call_set
+    } else
+      LOG_E(PHY, "Cannot Push %d.%d.%d (slot %d, subframe %d,last_slot %d)\n", frame, slot2, ru_id, slot, subframe, last_slot);
+    last_slot = slot2;
+    last_frame = frame;
   } // rx_sym == 7
 }
 void oai_xran_fh_srs_callback(void *pCallbackTag, xran_status_t status)