libtracker-bus: plug memleak when updating, GAsyncResult should always be unref-ed
libtracker-bus: plug memleak when updating, GAsyncResult should always be unref-ed

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