SAPI: Fix an off-by-one error in voice selection

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/text_renderer/sapi.cpp

@@ -124,7 +124,7 @@ static int Create (vlc_object_t *p_this)
                 int voiceIndex = var_InheritInteger(p_this, "sapi-voice");
                 if (voiceIndex > -1)
                 {
-                    if ((unsigned)voiceIndex <= ulCount) {
+                    if ((unsigned)voiceIndex < ulCount) {
                         hr = cpEnum->Item(voiceIndex, &cpVoiceToken);
                         if (SUCCEEDED(hr)) {
                             hr = p_sys->cpVoice->SetVoice(cpVoiceToken);