revisit pipe initialization and buffer management

- in dopipe(), get an already zeroed struct (PR_ZERO) instead of manually initialize each member (in pipe_create)
- rename pipespace() and pipe_free_kmem() to pipe_buffer_realloc() and pipe_buffer_free(): it is more evident that the functions works on the same thing
- in pipe_buffer_free(), return early and move the if-body as function body

No functional change intented.

ok anton@ visa@ mpi@

0 files changed, 0 insertions, 0 deletions