Added NOTSIG error code.

src/common/errcode.c

@@ -70,6 +70,7 @@ const error_table_t knot_error_msgs[] = {
 	{KNOT_ECNAME, "CNAME loop found in zone."},
 	{KNOT_ENODIFF, "Cannot create zone diff."},
 	{KNOT_EDSDIGESTLEN, "DS digest length does not match digest type."},
+	{KNOT_ENOTSIG, "expected a TSIG or SIG(0)" },
 
 	/* Zone file loader errors. */
 	{FLOADER_EFSTAT, "Fstat error!"},

src/common/errcode.h

@@ -84,6 +84,7 @@ enum knot_error {
 	KNOT_ECNAME,          /*!< CNAME loop found in zone. */
 	KNOT_ENODIFF,         /*!< No zone diff can be created. */
 	KNOT_EDSDIGESTLEN,    /*!< DS digest length does not match digest type. */
+	KNOT_ENOTSIG,         /*!< expected a TSIG or SIG(0) */
 
 	/* Zone file loader errors. */
 	FLOADER_EFSTAT,