fix(split): reserve peripheral slot before stopping scanning

In the event that the peripheral MAC address does not match, this allows
scanning to continue.

app/src/split/bluetooth/central.c

@@ -433,20 +433,22 @@ static int stop_scanning() {
 static bool split_central_eir_found(const bt_addr_le_t *addr) {
     LOG_DBG("Found the split service");
 
-    // Stop scanning so we can connect to the peripheral device.
-    int err = stop_scanning();
-    if (err < 0) {
-        return false;
-    }
-
+    // Reserve peripheral slot. Once the central has bonded to its peripherals,
+    // the peripheral MAC addresses will be validated internally and the slot
+    // reservation will fail if there is a mismatch.
     int slot_idx = reserve_peripheral_slot(addr);
     if (slot_idx < 0) {
-        LOG_ERR("Failed to reserve peripheral slot (err %d)", slot_idx);
+        LOG_INF("unable to reserve peripheral slot (err %d)", slot_idx);
         return false;
     }
-
     struct peripheral_slot *slot = &peripherals[slot_idx];
 
+    // Stop scanning so we can connect to the peripheral device.
+    int err = stop_scanning();
+    if (err < 0) {
+        return false;
+    }
+
     LOG_DBG("Initiating new connnection");
     struct bt_le_conn_param *param =
         BT_LE_CONN_PARAM(CONFIG_ZMK_SPLIT_BLE_PREF_INT, CONFIG_ZMK_SPLIT_BLE_PREF_INT,