[Toybox] [PATCH] Fix the pidof comm test.

[enh]

If we have a 15-byte name, we don't know whether comm actually matches
or is a truncated form of a longer name that has a common prefix.

For example, with "this-is-a-very-long-name-that-is-too-long", we shouldn't
match "this-is-a-very-" (but the old code would).

Bug: http://b/73123244
---
 lib/lib.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)
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