AudioFlinger: Fix memory allocation for client-less tracks am: 1159ffd5e3 am: f242b890c4 am: 24ef54ecb8 am: a35816475b am: 1ce123cf91 am: d06e47540d am: 103b751e55
am: 0851e2f4c6

Change-Id: I8401f004580f03d23a7423468f6966aba768e783