DirectSound: really fix uninitialized mutex (fixes #12845)

(cherry picked from commit 944d96f758f109bdea7d18a02d95b8cd30f828f3)

modules/audio_output/directsound.c

@@ -633,6 +633,9 @@ static HRESULT Start( vlc_object_t *obj, aout_stream_sys_t *sys,
     }
     free( psz_speaker );
 
+    vlc_mutex_init(&sys->lock);
+    vlc_cond_init(&sys->cond);
+
     if( AOUT_FMT_SPDIF( fmt ) && var_InheritBool( obj, "spdif" ) )
     {
         hr = CreateDSBuffer( obj, sys, VLC_CODEC_SPDIFL,
@@ -769,9 +772,6 @@ static HRESULT Start( vlc_object_t *obj, aout_stream_sys_t *sys,
         }
     }
 
-    vlc_mutex_init(&sys->lock);
-    vlc_cond_init(&sys->cond);
-
     int ret = vlc_clone(&sys->eraser_thread, PlayedDataEraser, (void*) obj,
                         VLC_THREAD_PRIORITY_LOW);
     if( unlikely( ret ) )