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Avoid possible overflow due to base note offset.

Subversion-branch: /branches/opl-branch
Subversion-revision: 1683

--- a/src/i_oplmusic.c

+++ b/src/i_oplmusic.c

@@ -934,6 +934,13 @@

     gm_voice = &voice->current_instr->voices[voice->current_instr_voice];

     note += (signed short) SHORT(gm_voice->base_note_offset);

+    // Avoid possible overflow due to base note offset:

+

+    if (note > 0x7f)

+    {

+        note = voice->note;

+    }

+

     freq_index = 64 + 32 * note + voice->channel->bend;

     // If this is the second voice of a double voice instrument, the