shared/io: Remove disconnect handler in io_destroy
shared/io: Remove disconnect handler in io_destroy

Diconnect callback may be called after destroying IO in next
mainloop iteration (it leada to reading freed data). Removing
disconnect handler prevents that situation.

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