sysmobts: Do not access out of bound string
sysmobts: Do not access out of bound string

One can either use "strlen(str) + 1" but not add one to the
result of the sizeof.

geosphere/osmo-bts,geosphere/osmo-bts,telenoobie/osmo-bts,geosphere/osmo-bts,osmocom/osmo-bts,telenoobie/osmo-bts,osmocom/osmo-bts,geosphere/osmo-bts,osmocom/osmo-bts,telenoobie/osmo-bts,telenoobie/osmo-bts