[Toybox] [PATCH] comm: stop using get_line().

[enh]

Also use FLAG().
---
 tests/comm.test   |  9 +++++++++
 toys/posix/comm.c | 28 ++++++++++++++--------------
 2 files changed, 23 insertions(+), 14 deletions(-)
 create mode 100755 tests/comm.test
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