utils/uriplaylistbin: intermittent test failure

Seen in https://gitlab.freedesktop.org/fengalin/gst-plugins-rs/-/jobs/19068904 while running cargo test [...] --all-features (which was not run on CI previously).

Running tests/uriplaylistbin.rs (target/debug/deps/uriplaylistbin-d48fc79ef088fd9c)
running 8 tests
0:00:00.184749151 50767 0x7f1d4c027580 ERROR         uriplaylistbin utils/uriplaylistbin/src/uriplaylistbin/imp.rs:1594:gsturiplaylistbin::uriplaylistbin::imp:<uriplaylistbin2> Error when processing item #1 (file:///not-there.ogg): Resource not found. (URI: file:///not-there.ogg)
test single_audio ... ok
test missing_file ... ok
test single_video ... ok
thread '<unnamed>' panicked at 'internal error: entered unreachable code', utils/uriplaylistbin/src/uriplaylistbin/imp.rs:353:18
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
fatal runtime error: failed to initiate panic, error 5

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utils/uriplaylistbin: intermittent test failure