Fix Bluedroid rebase error

Change-Id: I80a2f3767acaee6095389bb9579aad4241d7c42f
diff --git a/btif/src/btif_gatt_multi_adv_util.c b/btif/src/btif_gatt_multi_adv_util.c
index 0362fc4..17991c8 100644
--- a/btif/src/btif_gatt_multi_adv_util.c
+++ b/btif/src/btif_gatt_multi_adv_util.c
@@ -450,7 +450,7 @@
         return;
 
     // Clear both the inst_id and client_if values
-    for (i=0; i <  BTM_BleMaxMultiAdvInstanceCount(); i+=2)
+    for (int i=0; i <  BTM_BleMaxMultiAdvInstanceCount(); i+=2)
     {
         if (client_if == p_multi_adv_data_cb->clntif_map[i])
         {