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4f0dce3e41
Fix `-Wincompatible-pointer-types` error.
```
nslinkd.c:357:24: error: passing argument 2 of 'signal' from incompatible pointer type [-Wincompatible-pointer-types]
357 | signal(SIGHUP, sighup_handler);
| ^~~~~~~~~~~~~~
| |
| void (*)(void)
In file included from nslinkd.c:30:
/usr/include/signal.h:289:20: note: expected 'void (*)(int)' but argument is of type 'void (*)(void)'
289 | void (*signal(int, void (*)(int)))(int);
| ^~~~~~~~~~~~~
nslinkd.c:355:13: note: 'sighup_handler' declared here
355 | static void sighup_handler()
| ^~~~~~~~~~~~~~
```