libtracker-miner, storage: Fix memleak, GUnixMountEntry was not being disposed
libtracker-miner, storage: Fix memleak, GUnixMountEntry was not being disposed

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