opl: Fix crash when using OPL music.

The previous change to add the poll method to the music module
interface introduced a crash, as the OPL music struct does not
define a poll method.

2 files changed, 2 insertions, 1 deletions

diff --git a/src/i_oplmusic.c b/src/i_oplmusic.c
index 142e401a..678b275f 100644
--- a/src/i_oplmusic.c
+++ b/src/i_oplmusic.c
@@ -1479,6 +1479,7 @@ music_module_t music_opl_module =
     I_OPL_PlaySong,
     I_OPL_StopSong,
     I_OPL_MusicIsPlaying,
+    NULL,  // Poll
 };
 
 //----------------------------------------------------------------------
diff --git a/src/i_sound.c b/src/i_sound.c
index 1b61f06f..f107de69 100644
--- a/src/i_sound.c
+++ b/src/i_sound.c
@@ -279,7 +279,7 @@ void I_UpdateSound(void)
         sound_module->Update();
     }
 
-    if (music_module != NULL)
+    if (music_module != NULL && music_module->Poll != NULL)
     {
         music_module->Poll();
     }