libssh: drop two unused assigments #18684
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Reported by clang-tidy.
```
lib/vssh/libssh.c
lib/vssh/libssh.c:1342:9: error: Value stored to 'to_t' is never read [clang-analyzer-deadcode.DeadStores,-warnings-as-errors]
1342 | to_t = STRE_OK;
| ^
lib/vssh/libssh.c:1342:9: note: Value stored to 'to_t' is never read
lib/vssh/libssh.c:1349:9: error: Value stored to 'from_t' is never read [clang-analyzer-deadcode.DeadStores,-warnings-as-errors]
1349 | from_t = STRE_OK;
| ^
lib/vssh/libssh.c:1349:9: note: Value stored to 'from_t' is never read
2 warnings generated.
```
Ref: https://github.com/curl/curl/actions/runs/17909917954/job/50918955923?pr=18660#step:11:182
Cherry-picked from curl#18660
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Reported in macOS clang-tidy v21.1.1 build, after enabling libssh in it:
Ref: https://github.com/curl/curl/actions/runs/17909917954/job/50918955923?pr=18660#step:11:182
Cherry-picked from #18660