AU: Handle firmware update failure when booted from FW slot B.

subprocess.cc

Index: subprocess.cc
diff --git a/subprocess.cc b/subprocess.cc
old mode 100755
new mode 100644
index 9c1936708647d614e66eb81aad38bcde40a4bd60..f6c1e3dc3778993525d4afbda59feb93d72a9cfc
--- a/subprocess.cc
+++ b/subprocess.cc
@@ -29,14 +29,18 @@ void Subprocess::GChildExitedCallback(GPid pid, gint status, gpointer data) {
   close(fd);
 
   g_spawn_close_pid(pid);
+  gint use_status = status;
+  if (WIFEXITED(status))
+    use_status = WEXITSTATUS(status);
+
   if (status) {
-    LOG(INFO) << "Subprocess status: " << status;
+    LOG(INFO) << "Subprocess status: " << use_status;
   }
   if (!record->stdout.empty()) {
     LOG(INFO) << "Subprocess output:\n" << record->stdout;
   }
   if (record->callback) {
-    record->callback(status, record->stdout, record->callback_data);
+    record->callback(use_status, record->stdout, record->callback_data);
   }
   Get().subprocess_records_.erase(record->tag);
 }