Call aout_PacketDestroy() on error paths too

aout_PacketInit() does not allocate anything yet, but it will have too.

By the way, the error paths of the (untouched by the commit)
DirectSound plugin seem a bit suspicious to me...

modules/audio_output/alsa.c

@@ -501,6 +501,7 @@ static int Open (vlc_object_t *obj)
                    VLC_THREAD_PRIORITY_OUTPUT ) )
     {
         msg_Err( p_aout, "cannot create ALSA thread (%m)" );
+        aout_PacketDestroy (p_aout);
         vlc_sem_destroy( &p_sys->wait );
         goto error;
     }

modules/audio_output/auhal.c

@@ -796,6 +796,7 @@ static int OpenSPDIF( audio_output_t * p_aout )
     if( err != noErr )
     {
         msg_Err( p_aout, "AudioDeviceCreateIOProcID failed: [%4.4s]", (char *)&err );
+        aout_PacketDestroy (p_aout);
         return false;
     }
 
@@ -816,6 +817,7 @@ static int OpenSPDIF( audio_output_t * p_aout )
         {
             msg_Err( p_aout, "AudioDeviceDestroyIOProcID failed: [%4.4s]", (char *)&err );
         }
+        aout_PacketDestroy (p_aout);
         return false;
     }
 

modules/audio_output/jack.c

@@ -236,6 +236,7 @@ error_out:
         {
             jack_deactivate( p_sys->p_jack_client );
             jack_client_close( p_sys->p_jack_client );
+            aout_PacketDestroy( p_aout );
         }
         free( p_sys->p_jack_ports );
         free( p_sys->p_jack_buffers );

modules/audio_output/oss.c

@@ -508,6 +508,7 @@ static int Open( vlc_object_t *p_this )
     {
         msg_Err( p_aout, "cannot create OSS thread (%m)" );
         close( p_sys->i_fd );
+        aout_PacketDestroy( p_aout );
         free( p_sys );
         return VLC_ENOMEM;
     }

modules/audio_output/portaudio.c

@@ -544,6 +544,7 @@ static int PAOpenStream( audio_output_t *p_aout )
                      paLastHostErrorInfo->errorText );
         }
         p_sys->p_stream = 0;
+        aout_PacketDestroy( p_aout );
         return VLC_EGENERIC;
     }
 
@@ -552,6 +553,7 @@ static int PAOpenStream( audio_output_t *p_aout )
     {
         msg_Err( p_aout, "Pa_StartStream() failed" );
         Pa_CloseStream( p_sys->p_stream );
+        aout_PacketDestroy( p_aout );
         return VLC_EGENERIC;
     }
 

modules/audio_output/waveout.c

@@ -311,6 +311,7 @@ static int Open( vlc_object_t *p_this )
         malloc( p_aout->sys->i_buffer_size );
     if( p_aout->sys->p_silence_buffer == NULL )
     {
+        aout_PacketDestroy( p_aout );
         free( p_aout->sys );
         return VLC_ENOMEM;
     }