dns_rdata_fromwire_text fixes:

* Disallow compression pointers in names as we are not
  reading from a packet and as a result length checks fail.
* Increase totext buffer size as fuzzer ran out of space on
  big bitmaps.
* NUL terminate totext to make fault diagnosis easier.
* Add debugging messages to make fault diagnosie easier.

fuzz/main.c

@@ -24,6 +24,8 @@
 
 #include <dirent.h>
 
+bool debug = false;
+
 static void
 test_all_from(const char *dirname) {
 	DIR *dirp;
@@ -98,6 +100,10 @@ main(int argc, char **argv) {
 	UNUSED(argc);
 	UNUSED(argv);
 
+	if (argc != 1) {
+		debug = true;
+	}
+
 	target = (target != NULL) ? target + 1 : argv[0];
 	if (strncmp(target, "lt-", 3) == 0) {
 		target += 3;