EMDF: Fix secondary protection bits parsing

Author: cjee21

Source/MediaInfo/Audio/File_Ac3.cpp

@@ -4276,8 +4276,7 @@ void File_Ac3::emdf_protection()
         default:; //Cannot append, read only 2 bits
     };
     Skip_BS(len_primary,                                        "protection_bits_primary");
-    if (len_second)
-        Skip_BS(len_primary,                                    "protection_bits_secondary");
+    Skip_BS(len_second,                                         "protection_bits_secondary");
 
     Element_End0();
 }