examples: check more errors, fix cleanups, scope variables #19055
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```
/Users/runner/work/curl/curl/docs/examples/http2-upload.c:289:10: error: Opened stream never closed. Potential resource leak [clang-analyzer-unix.Stream,-warnings-as-errors]
289 | return 0;
| ^
/Users/runner/work/curl/curl/docs/examples/http2-upload.c:222:9: note: Stream opened here
222 | out = fopen(filename, "wb");
| ^~~~~~~~~~~~~~~~~~~~~
```
https://github.com/curl/curl/actions/runs/18484735519/job/52666174365?pr=19055
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Inspired by Joshua's report on examples.
w/o sp https://github.com/curl/curl/pull/19055/files?w=1
I left these files mostly as-is:
http2-download.c, http2-pushinmemory.c, http2-serverpush.c
They leak various resources.