git: ping(8): Add check for negative wait timeout

[Aaron LI]

commit a1d2059d12313579701c7fdf950096f917750696
Author: Aaron LI <aly at aaronly.me>
Date:   Mon Mar 4 14:08:10 2024 +0800

    ping(8): Add check for negative wait timeout
    
    Meanwhile, fix the error message.

Summary of changes:
 sbin/ping/ping.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/a1d2059d12313579701c7fdf950096f917750696


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