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The `udp_ready()` and `tcp_connected()` functions in dighost.c are
used for similar purposes for UDP and TCP respectively.
Synchronize the `udp_ready()` function entry code to behave like
`tcp_connected()` by adding input validation, debug messages and
early exit code when `cancel_now` is `true`.
(cherry picked from commit
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| .. | ||
| .gitignore | ||
| dig.c | ||
| dig.rst | ||
| dighost.c | ||
| dighost.h | ||
| host.c | ||
| host.rst | ||
| Makefile.am | ||
| nslookup.c | ||
| nslookup.rst | ||
| readline.h | ||