af_ashowinfo: print a more descriptive name for AV_MATRIX_ENCODING_DOLBY

libavfilter/af_ashowinfo.c

@@ -83,7 +83,7 @@ static void dump_matrixenc(AVFilterContext *ctx, AVFrameSideData *sd)
     enc = *(enum AVMatrixEncoding *)sd->data;
     switch (enc) {
     case AV_MATRIX_ENCODING_NONE:           av_log(ctx, AV_LOG_INFO, "none");                break;
-    case AV_MATRIX_ENCODING_DOLBY:          av_log(ctx, AV_LOG_INFO, "Dolby");               break;
+    case AV_MATRIX_ENCODING_DOLBY:          av_log(ctx, AV_LOG_INFO, "Dolby Surround");      break;
     case AV_MATRIX_ENCODING_DPLII:          av_log(ctx, AV_LOG_INFO, "Dolby Pro Logic II");  break;
     case AV_MATRIX_ENCODING_DPLIIX:         av_log(ctx, AV_LOG_INFO, "Dolby Pro Logic IIx"); break;
     case AV_MATRIX_ENCODING_DPLIIZ:         av_log(ctx, AV_LOG_INFO, "Dolby Pro Logic IIz"); break;