Fixes filtering correct file types.

src/org/jitsi/util/SoundFileUtils.java

@@ -98,7 +98,7 @@ public static boolean isSoundFile(File f, String[] soundFormats)
                 return (Arrays.binarySearch(
                             soundFormats,
                             ext,
-                            String.CASE_INSENSITIVE_ORDER) != -1);
+                            String.CASE_INSENSITIVE_ORDER) > -1);
             }
         }
         return false;