static_cast is preferable to reinterpret_cast when casting from void*
pointers returned by malloc/calloc/realloc/mmap calls.
Discovered while looking at compiler warnings (b/26936282).
Test: WITH_TIDY=1 WITH_STATIC_ANALYZER=1 mma
Change-Id: I151642d5a60c94f312d0611576ad0143c249ba3d