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 am: f2dadab7e1  -s ours
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Change-Id: I3e9330c07d2a59b74e2295bbfb691356c0da6543