Bug#885525: better log output

[Russell Klopfer]

*** Error in `nm-applet': free(): invalid pointer: 0x0000564977f3ab30 
***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x722fb)[0x7f0fe1c7c2fb]
/lib/x86_64-linux-gnu/libc.so.6(+0x7895e)[0x7f0fe1c8295e]
/lib/x86_64-linux-gnu/libc.so.6(+0x791be)[0x7f0fe1c831be]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_datalist_clear+0x6b)[0x7f0fe21f945b]
/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0(g_object_unref+0x1a2)[0x7f0fe24f3ea2]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x38e41)[0x7f0fe2203e41]
/usr/lib/x86_64-linux-gnu/libnm.so.0(+0x62187)[0x7f0fe3475187]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_datalist_clear+0x6b)[0x7f0fe21f945b]
/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0(g_object_unref+0x1a2)[0x7f0fe24f3ea2]
nm-applet(+0x1629c)[0x5649777c029c]
nm-applet(+0x198fc)[0x5649777c38fc]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x47724)[0x7f0fe2212724]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_dispatch+0x155)[0x7f0fe2215e15]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x4b1e0)[0x7f0fe22161e0]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_iteration+0x2c)[0x7f0fe221626c]
/usr/lib/x86_64-linux-gnu/libgio-2.0.so.0(g_application_run+0x1fd)[0x7f0fe27d3bed]
nm-applet(+0x101b1)[0x5649777ba1b1]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1)[0x7f0fe1c2a561]
nm-applet(+0x102da)[0x5649777ba2da]