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

[enh]

We don't even need to read from /proc at all here: we can get the time
since boot from clock_gettime(2) directly.

Also, since TT.buf is only used for the timestamp, give it that name.
---
 toys/pending/bootchartd.c | 28 +++++++---------------------
 1 file changed, 7 insertions(+), 21 deletions(-)
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