bugfix -- transcode_n cannot return the concatenated string in the

special case where the encoding and decoding are the same

src/vmod_blobcode.c

@@ -484,7 +484,7 @@ transcode(VRT_CTX, VCL_INT n, VCL_ENUM decs, VCL_ENUM encs,
 	 * If the encoding and decoding are the same, and the decoding was
 	 * legal, just return the concatenated string.
 	 */
-	if (enc == dec) {
+	if (n == -1 && enc == dec) {
 		VCL_STRING s;
 		s = VRT_String(ctx->ws, NULL, p, ap);
 		return s;