Fix FD leak in POSIX pipe setup and correct write_all_nullptr_case#1201
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…pipe setup - freestanding/io_buffer/output.h: fix write_all_nullptr_case to dispatch to scatter_write_all(_bytes)_decay on the output stream (optstm), and keep buffer_curr consistent. - hosted/platforms/posix.h: avoid FD leaks in the POSIX pipe constructor by wrapping FDs with posix_file_factory and setting FD_CLOEXEC; transfer ownership explicitly and keep a single assignment point. No API changes. Success paths unchanged. Rebase-only history preserved.
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This PR fixes two issues in the file/device I/O path:
scatter_write_all(_bytes)_decay on the output stream and keep buffer pointers
consistent.
(posix_file_factory) and setting FD_CLOEXEC; make ownership transfer explicit
and maintain a single assignment point.
Notes: