This reverts commit 908d0b93.

Spotted by a warning.

The playlist needs to be fixed here not to use signed for its size, but...

nuv: Fix some warnings and fix an issue where some unitialized pointer access could lead to a crash.

configure: Add "missing-braces nonnull parentheses uninitialized address enum-compare undef comment switch" to the list of warnings that should not appear anymore in source code.