Typo fixed.

src/common/descriptor.c

@@ -318,7 +318,7 @@ int knot_rrtype_is_metatype(const uint16_t type)
 	       type == KNOT_RRTYPE_ANY;
 }
 
-int knot_rrtype_is_ddns_forbidenen(const uint16_t type)
+int knot_rrtype_is_ddns_forbidden(const uint16_t type)
 {
 	return type == KNOT_RRTYPE_RRSIG  ||
 	type == KNOT_RRTYPE_DNSKEY  ||

src/common/descriptor.h

@@ -285,7 +285,7 @@ int knot_rrtype_is_metatype(const uint16_t type);
  * \retval > 0 if YES.
  * \retval 0 if NO.
  */
-int knot_rrtype_is_ddns_forbidenen(const uint16_t type);
+int knot_rrtype_is_ddns_forbidden(const uint16_t type);
 
 #endif // _KNOT_DESCRIPTOR_H_