Comment 2 for bug 757407

StacktraceTop:
 __strcmp_sse42 () at ../sysdeps/x86_64/multiarch/strcmp.S:260
 brasero_volume_get_gvolume (volume=<value optimized out>) at brasero-volume.c:103
 brasero_volume_get_mount_point (volume=<value optimized out>, error=0x0) at brasero-volume.c:175
 brasero_volume_is_mounted (volume=0x1d9c340) at brasero-volume.c:141
 brasero_burn_unmount (self=0x2f019b0, medium=0x1d9c340, error=0x7fff3d0187b8) at brasero-burn.c:319