[Toybox] [PATCH] getline() returns -1 on EOF, not 0.

[enh]

...but you can get 0 if you have a "no newline at end of file" file.

I've been through all the current callers, and just these ones weren't
using the canonical test.
---
 toys/lsb/mount.c       | 2 +-
 toys/pending/init.c    | 2 +-
 toys/pending/lsof.c    | 2 +-
 toys/pending/userdel.c | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)
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