Rename and fix comments and typo.

Test: all tests are still passing.
Bug: None

Change-Id: I931d299525f03f06693ebbcb1a74a027a92808c2
diff --git a/services/vr/bufferhubd/buffer_node.cpp b/services/vr/bufferhubd/buffer_node.cpp
index 6ffd24d..1eba4ae 100644
--- a/services/vr/bufferhubd/buffer_node.cpp
+++ b/services/vr/bufferhubd/buffer_node.cpp
@@ -44,8 +44,8 @@
   uint64_t client_state_mask = 0ULL;
   uint64_t updated_active_clients_bit_mask = 0ULL;
   do {
-    client_state_mask =
-        BufferHubDefs::FindNextClearedBit(current_active_clients_bit_mask);
+    client_state_mask = BufferHubDefs::FindNextAvailableClientStateMask(
+        current_active_clients_bit_mask);
     if (client_state_mask == 0ULL) {
       ALOGE(
           "BufferNode::AddNewActiveClientsBitToMask: reached the maximum "