Clear out warnings about unused variables #1229
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Seen while compile eBPF using `make CC=clang`.
```
opensnitch.c:330:6: warning: unused variable 'zero_key' [-Wunused-variable]
330 | u32 zero_key = 0;
| ^~~~~~~~
opensnitch.c:372:6: warning: unused variable 'zero_key' [-Wunused-variable]
372 | u32 zero_key = 0;
```
Signed-off-by: Ariel Otilibili <otilibil@eurecom.fr>
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Seen while compile eBPF using
make CC=clang.