Merge pull request #2175 from cgwalters/coverity-2020.5

Two small Coverity fixes

src/libostree/ostree-repo-pull.c

@@ -436,8 +436,9 @@ ensure_idle_queued (OtPullData *pull_data)
   idle_src = g_idle_source_new ();
   g_source_set_callback (idle_src, idle_worker, pull_data, NULL);
   g_source_attach (idle_src, pull_data->main_context);
-  g_source_unref (idle_src);
   pull_data->idle_src = idle_src;
+  /* Ownership is transferred to pull_data */
+  g_source_unref (idle_src);
 }
 
 typedef struct {

src/switchroot/ostree-prepare-root.c

@@ -101,10 +101,9 @@ sysroot_is_configured_ro (const char *sysroot)
   bool ret = false;
   char *line = NULL;
   size_t len = 0;
-  ssize_t nread;
   /* Note getline() will reuse the previous buffer */
   bool in_sysroot = false;
-  while ((nread = getline (&line, &len, f)) != -1)
+  while (getline (&line, &len, f) != -1)
     {
       /* This is an awful hack to avoid depending on GLib in the
        * initramfs right now.