wget exit code with -nc

[Abhishek Raj]

If I try downloading a file which already exists with wget using the
--no-clobber option, it works as expected but the exit code is 1 which is
crashing my scripts. Why does this result in a non-zero exit code?

$ wget -nc --output-document "/home/User/Downloads/sample.pdf"
http://www.africau.edu/images/default/sample.pdf
--2021-02-07 17:52:01--  http://www.africau.edu/images/default/sample.pdf
Resolving www.africau.edu (www.africau.edu)... 172.67.148.215,
104.21.63.175, 2606:4700:3030::ac43:94d7, ...
Connecting to www.africau.edu (www.africau.edu)|172.67.148.215|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 3028 (3.0K) [application/pdf]
Saving to: ‘/home/User/Downloads/sample.pdf’

/home/User/Downloads/sample.pdf
100%[===============================================================================================================>]
  2.96K  --.-KB/s    in 0s

2021-02-07 17:52:01 (137 MB/s) - ‘/home/User/Downloads/sample.pdf’
saved [3028/3028]

$ echo $?
0
$ wget -nc --output-document "/home/User/Downloads/sample.pdf"
http://www.africau.edu/images/default/sample.pdf
File ‘/home/User/Downloads/sample.pdf’ already there; not retrieving.
$ echo $?
1