[tracker] (17 commits) ...Merge branch 'wip/carlosg/coverity-fixes' into 'master'

[Sam Thursfield <sthursfield src gnome org>]

Summary of changes:

  a8b01f9... tracker: Check return value of g_file_get_contents (*)
  dd885f9... libtracker-sparql: Check return values of XML writer functi (*)
  4c85537... tracker: Check return value of g_setenv (*)
  b3f284f... tracker: Test return value of g_file_get_contents() (*)
  e44bae2... libtracker-data: Check return value of g_unlink (*)
  1309e11... libtracker-data: Check return value of g_mkdir_with_parents (*)
  c81805e... libtracker-data: Warn in place during rollback on first tim (*)
  c72717a... libtracker-data: Check the return value of write_ontologies (*)
  04decee... libtracker-data: Do not check for out variable being NULL (*)
  854e033... tracker: Check the return value of g_filename_to_utf8() (*)
  7e3159c... libtracker-data: Free query variable earlier (*)
  c372fbc... libtracker-data: Handle TrackerBinding together in code (*)
  d030fd7... docs: Avoid GError double free (*)
  3f50c15... docs: Initialize variable (*)
  ae37000... docs: Initialize variable (*)
  941fd6f... libtracker-data: Avoid propagating errors based on uninitia (*)
  000bc5f... Merge branch 'wip/carlosg/coverity-fixes' into 'master'

(*) This commit already existed in another branch; no separate mail sent