libtracker-miner: Do not leak the TrackerSparqlConnection
libtracker-miner: Do not leak the TrackerSparqlConnection

https://bugzilla.gnome.org/show_bug.cgi?id=725890

outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker