Fix compile with gcc 14.2.1

[Waqar144]

Fixes -Werror=maybe-uninitialized warnings

[Waqar144]

There are also -Werror=format-overflow warnings in file_utils.c file_append_path_temp():

sprintf(path_buffer, "%s/%s", path, name);
...
sprintf(path_buffer, "%s%s", path, name);

I just locally added -Wno-format-overflow to avoid them for now.

[lerno]

Could we instead set these to an invalid value? So rather than null, perhaps (void*)-1, and the len similarly. The best would be to add a #define like #define NO_INIT_PTR (void*)0xAAAAAAAA or something.

[lerno]

Thank you!