pull: Fix a used before initialization warning

src/libostree/ostree-repo-pull.c:1676:22: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized]

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

src/libostree/ostree-repo-pull.c

@@ -1322,7 +1322,7 @@ ostree_repo_pull_with_options (OstreeRepo             *self,
   char **configured_branches = NULL;
   guint64 bytes_transferred;
   guint64 end_time;
-  OstreeRepoPullFlags flags;
+  OstreeRepoPullFlags flags = 0;
   const char *dir_to_pull = NULL;
   char **refs_to_fetch = NULL;
   gboolean is_mirror;