`utils_free_pointers()` has a clear name, but requires a leading count of
pointers, which could be too big or too small, and a trailing NULL, to try to
detect if the count is too big.
I realized now we require C99, we can solve all these issues with a macro:
```c
#define FREE_EACH(...) do { \
void *_arr[] = {__VA_ARGS__}; \
for (guint _i = 0; _i < G_N_ELEMENTS(_arr); _i++) \
g_free(_arr[_i]); \
} while (0)
```
Shall I make a PR?
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