examples/sessioninfo: cast printf string mask length to int #18918
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Also drop unnecessary parenthesis.
Found via `-Wformat-signedness`:
```
docs/examples/sessioninfo.c: In function 'wrfu':
docs/examples/sessioninfo.c:75:53: error: field precision specifier '.*' expects argument of type 'int', but argument 4 has type 'unsigned int' [-Werror=format=]
fprintf(stderr, "Certificate #%u: %.*s", i, dn.size, dn.data);
^
```
Ref: https://github.com/curl/curl/actions/runs/18320729052/job/52172864438?pr=18343#step:13:30
Ref: curl#18343
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Found via
-Wformat-signedness:Ref: https://github.com/curl/curl/actions/runs/18320729052/job/52172864438?pr=18343#step:13:30
Ref: https://github.com/curl/curl/actions/runs/18320729095/job/52172886899?pr=18343#step:19:27
Also:
Ref: #18343