Fix minor inconsistencies in comment.

hiredis.c

@@ -1097,10 +1097,10 @@ int redisBufferRead(redisContext *c) {
  *
  * Returns REDIS_OK when the buffer is empty, or (a part of) the buffer was
  * succesfully written to the socket. When the buffer is empty after the
- * write operation, "wdone" is set to 1 (if given).
+ * write operation, "done" is set to 1 (if given).
  *
  * Returns REDIS_ERR if an error occured trying to write and sets
- * c->error to hold the appropriate error string.
+ * c->errstr to hold the appropriate error string.
  */
 int redisBufferWrite(redisContext *c, int *done) {
     int nwritten;