Bug#653516: vlc segfaults by trying to open a directory if playlist is visible

[reini]

It doesn't happen reliably here, either, but it seems more likely to happen 
when another instance of vlc is running in the background. I'm running KDE, so 
it doesn't have anything with gnome-related software per se. Running vlc from 
konqueror or the command line doesn't matter, both segfault equally often.

Here's a gdb backtrace (I edited the dvd directory's path out):
(gdb) bt
#0  0x00007ffff5377cb4 in DVDOpen (ppath=0x72d9c0 "/path/to/DVDDIR/")
    at /build/buildd-libdvdread_4.2.0-1-amd64-
cnJJSM/libdvdread-4.2.0/src/dvd_reader.c:459
#1  0x00007ffff55a63b3 in vm_reset (vm=0x959b20, dvdroot=0x72d9c0 
"/path/to/DVDDIR/")
    at /build/buildd-libdvdnav_4.2.0-1-amd64-
uPwmIO/libdvdnav-4.2.0/src/vm/vm.c:358
#2  0x00007ffff559c62c in dvdnav_open (dest=0x7fffe084a980, path=0x72d9c0 
"/path/to/DVDDIR/")
    at /build/buildd-libdvdnav_4.2.0-1-amd64-
uPwmIO/libdvdnav-4.2.0/src/dvdnav.c:99
#3  0x00007ffff57b7f17 in Open () from 
/usr/lib/vlc/plugins/access/libdvdnav_plugin.so
#4  0x00007ffff7964d75 in module_need () from /usr/lib/libvlccore.so.4
#5  0x00007ffff79211fc in __demux_New () from /usr/lib/libvlccore.so.4
#6  0x00007ffff792ddd4 in InputSourceInit () from /usr/lib/libvlccore.so.4
#7  0x00007ffff792f128 in Init () from /usr/lib/libvlccore.so.4
#8  0x00007ffff7932755 in Run () from /usr/lib/libvlccore.so.4
#9  0x00007ffff796a0f4 in thread_entry () from /usr/lib/libvlccore.so.4
#10 0x00007ffff76c4b50 in start_thread (arg=<optimized out>) at 
pthread_create.c:304
#11 0x00007ffff720b90d in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()