Fix warnings and errors introduced in b030bf5

Change-Id: I23966b6a79c0d2cbab2e01c649c1b991f460d8ad

apps/misc.c

@@ -534,7 +534,9 @@ static void lo_unplug_change(bool inserted)
 #ifdef HAVE_LINEOUT_POWEROFF
     lineout_set(inserted);
 #else
+#ifdef AUDIOHW_HAVE_LINEOUT
     audiohw_set_lineout_volume(0,0); /*hp vol re-set by this function as well*/
+#endif
     static bool lineout_caused_pause = true;
 
     if (global_settings.unplug_mode)

firmware/drivers/audio/sdl.c

@@ -66,6 +66,13 @@ void audiohw_set_volume(int vol_l, int vol_r)
 }
 #endif /* AUDIOHW_HAVE_MONO_VOLUME */
 
+#ifdef AUDIOHW_HAVE_LINEOUT
+void audiohw_set_lineout_volume(int vol_l, int vol_r)
+{
+    (void)vol_l; (void)vol_r;
+}
+#endif
+
 #if defined(AUDIOHW_HAVE_PRESCALER)
 void audiohw_set_prescaler(int value)
 {

firmware/target/hosted/xduoo/button-xduoo.c

@@ -36,6 +36,7 @@
 #include "kernel.h"
 #include "backlight.h"
 #include "backlight-target.h"
+#include "xduoolinux_codec.h"
 
 static bool soft_hold = false;
 #ifndef BOOTLOADER