android/A2DP: Fix invalid read
android/A2DP: Fix invalid read

Invalid read of size 8
   at 0x30EE465A78: g_slice_free_chain_with_offset (in /usr/lib64/libglib-2.0.so.0.3800.2)
   by 0x418209: bt_a2dp_unregister (a2dp.c:1576)
   by 0x4039E6: main (main.c:347)
 Address 0x4f2d248 is 8 bytes inside a block of size 16 free'd
   at 0x4A07577: free (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
   by 0x30EE44EF7E: g_free (in /usr/lib64/libglib-2.0.so.0.3800.2)
   by 0x30EE4655CA: g_slice_free1 (in /usr/lib64/libglib-2.0.so.0.3800.2)
   by 0x30EE465F0C: g_slist_remove (in /usr/lib64/libglib-2.0.so.0.3800.2)
   by 0x41645F: a2dp_device_free (a2dp.c:174)
   by 0x30EE466477: g_slist_foreach (in /usr/lib64/libglib-2.0.so.0.3800.2)
   by 0x30EE46649A: g_slist_free_full (in /usr/lib64/libglib-2.0.so.0.3800.2)
   by 0x418209: bt_a2dp_unregister (a2dp.c:1576)
   by 0x4039E6: main (main.c:347)

pkarasev3/bluez,ComputeCycles/bluez,ComputeCycles/bluez,ComputeCycles/bluez,silent-snowman/bluez,pstglia/external-bluetooth-bluez,pstglia/external-bluetooth-bluez,pkarasev3/bluez,mapfau/bluez,pstglia/external-bluetooth-bluez,pkarasev3/bluez,mapfau/bluez,mapfau/bluez,silent-snowman/bluez,mapfau/bluez,pstglia/external-bluetooth-bluez,silent-snowman/bluez,silent-snowman/bluez,ComputeCycles/bluez,pkarasev3/bluez