DO NOT MERGE ANYWHERE: Remove several memset() calls which overwrote buffers initialized in buf_mgr_init().  Affects 6.0 only. am: daefcde2ed  -s ours am: 42f2d92bc4  -s ours am: 27c8fce9b9  -s ours am: 80f638941c  -s ours
am: c34aea40a8  -s ours

Change-Id: Iab782b739a1dbb3fb1e1c714da87df8802eb5449