rustls: fix clang-tidy warning #18670
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reported by clang-tidy:
```
lib/vtls/rustls.c:415:23: error: File position of the stream might be 'indeterminate'
after a failed operation. Can cause undefined behavior [clang-analyzer-unix.Stream,-warnings-as-errors]
415 | const size_t rr = fread(buf, 1, sizeof(buf), f);
| ^
```
Ref: https://github.com/curl/curl/actions/runs/17898248031/job/50887746633?pr=18660#step:11:174
Cherry-picked from curl#18660
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Seen with v21.1.1, non-debug-enabled build:
Ref: https://github.com/curl/curl/actions/runs/17898248031/job/50887746633?pr=18660#step:11:174
Cherry-picked from #18660