[Toybox] [PATCH] Better tail -f error checking.

[enh]

Check for fatal errors, and exit immediately if we don't actually have
anything to -f --- something like "tail -f /does/not/exist" should exit:
it's -f's big brother -F that retries by name rather than by fd.
---
 toys/posix/tail.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)


-- 
Elliott Hughes - http://who/enh - http://jessies.org/~enh/
Android native code/tools questions? Mail me/drop by/add me as a reviewer.
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