thermometer: Fix bad read operation when time stamp is not provided
thermometer: Fix bad read operation when time stamp is not provided

Time stamp value is an optional field provided in the measure, so next
value in the array will start in a different index depending if the time
stamp was provided or not. This patch check this case and update the
index to a proper value in the byte array before reading the temperature
type value.

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