Add missing comma in Volume ResourceWrapper class

Change-Id: Ie0b0f40966f6bf98f693a971fdb498537842b21e
Closes-Bug: #1308642
(cherry picked from commit c45449c3a979c15ae414934fe162fbb4f0502ba0)
(cherry picked from commit fbd5b2e3668989a78f55e1a16a5ab0455d1acb83)