monitor: Fix integer overruns with EIR parsing
monitor: Fix integer overruns with EIR parsing

For tracking how much has been parsed of the EIR we must use a greater
than uint8 integer to avoid having a large (e.g. 255) field length cause
our counter to wrap around and start from zero.

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