minor stuff -- remove an unnecessary #define, and fix a comment

src/vmod_blobcode.c

@@ -38,8 +38,6 @@
 #include "vmod_blobcode.h"
 #include "wb.h"
 
-#define MAX_VCL_ERRMSG 64
-
 struct vmod_blobcode_blob {
 	unsigned magic;
 #define VMOD_BLOBCODE_BLOB_MAGIC 0xfade4fa9

src/vmod_blobcode.h

@@ -89,7 +89,7 @@ ssize_t encode_f(const enum encoding enc, char *restrict const buf,
  *
  * Returns:
  * -1, if there is insufficient space at buf, or if the decoding is
- *     invalid (XXX: set errno to ENOMEM or EINVALID)
+ *     invalid; errno SHALL be set to ENOMEM or EINVALID, respectively
  * 0, if the length of the decoding is 0 -- the caller should return
  *    a static constant empty BLOB
  * otherwise, the number of bytes written