That attribute was uninitialized before, which could crash
libavformat.

See Debian bug 760669

See code comment.  Fixes assertion failure in
decoder_command_finished().

Log call was added to the wrong branch.

Fixes regression by commit ca1a1149

Eliminate the duplicate pa_operation_get_state() call.

Casting std::numeric_limits<unsigned>::max() to "long" leads to an
overflow if sizeof(unsigned)==sizeof(long), and the result will be -1.

This happens on some 32 bit architectures, for example ARM and WIN32.

Workaround: use std::numeric_limits<int>::max(), which is the largest
signed integer.  Since sizeof(long)>=sizeof(int), this will never
overflow.

Fixes Mantis ticket 0004080.

Since BroadcastError() calls BroadcastMountError(), there's no need to
check mount_finished here.

While reconnecting to the NFS server, the socket is -1, because there
is no socket.  Fixes a potential crash (assertion failure).

Fixes hanging NFS client.

The standard has been renamed since the early draft that was
implemented in MPD.

The "current" attribute is a "song order", not a "song position".
This is usually the same - except in random mode.  Fixes Mantis ticket
0004073.

Fix incorrect description of the "songs" field and add missing
"albums" field.
Signed-off-by: Joachim Fasting <joachifm@fastmail.fm>

Simply return an empty WritableBuffer, not a nulled one.

Finally allows loading playlist files on a storage plugin.  Commit
297e2747 attempted to implement this, but failed due to this bug.

Necessary for "final" on gcc 4.6.