Avoid unnecessary assignment in generated audio type converters.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403417

src/audio/sdlgenaudiocvt.pl

@@ -252,9 +252,8 @@ EOF
         }
 
         print <<EOF;
-    format = AUDIO_$to;
     if (cvt->filters[++cvt->filter_index]) {
-        cvt->filters[cvt->filter_index] (cvt, format);
+        cvt->filters[cvt->filter_index] (cvt, AUDIO_$to);
     }
 }