Snippets for libisofs 1.5.8 from Alpine riscv64

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-riscv64/main/libisofs/libisofs-1.5.8-r0.log.

• libisofs/builder.c:191:29: warning: 'link' may be used uninitialized [-Wmaybe-uninitialized]
    191 |                 link->fs_id = fs->get_id(fs);
        |                             ^
  

• libisofs/builder.c:210:32: warning: 'special' may be used uninitialized [-Wmaybe-uninitialized]
    210 |                 special->fs_id = fs->get_id(fs);
        |                                ^