Remove pointless CONFIG_MLP_DECODER preprocessor check.

The file is only ever compiled if the MLP decoder is enabled.

Originally committed as revision 20968 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/mlpdec.c

@@ -1134,7 +1134,6 @@ error:
     return -1;
 }
 
-#if CONFIG_MLP_DECODER
 AVCodec mlp_decoder = {
     "mlp",
     CODEC_TYPE_AUDIO,
@@ -1146,7 +1145,6 @@ AVCodec mlp_decoder = {
     read_access_unit,
     .long_name = NULL_IF_CONFIG_SMALL("MLP (Meridian Lossless Packing)"),
 };
-#endif /* CONFIG_MLP_DECODER */
 
 #if CONFIG_TRUEHD_DECODER
 AVCodec truehd_decoder = {