Remove Warnings

[synthfi]

Changes

• added a const qualifier in keyboard_buddies to resolve compilation warning
• added a return 0 in daemonize to resolve a compilation warning
  • I am unsure if this is the correct thing to do

Notes

• compiling w/ g++ 16.1.1 on fedora 44 aarch64
• I saw this while running the tests, I don't know if this is a problem

=== tests/test_pcl26j_free ===
PASS: request_range: pmem_free called with header ptr, not data ptr
PASS: synced_down_folder: pmem_free called with header ptr, not data ptr
PASS: folder_tasks: pmem_free called with header ptr, not data ptr
PASS: sector_inlog: pmem_free called with header ptr, not data ptr
BAD FREE: 0x232b4a50 was not a malloc-returned pointer
PASS: harness self-check: bare free(data_ptr) correctly flagged