Add coccinelle rule to favor DNS_SIGTYPE

This should error if DNS_TYPEPAIR_VALUE(dns_rdatatype_rrsig, type) is
used.

diff --git a/cocci/DNS_TYPEPAIR_VALUE.spatch b/cocci/DNS_TYPEPAIR_VALUE.spatch
new file mode 100644 (file)
index 0000000..4c51294
--- /dev/null
+++ b/cocci/DNS_TYPEPAIR_VALUE.spatch
@@ -0,0 +1,7 @@
+@@
+identifier RRSIG = dns_rdatatype_rrsig;
+expression T;
+@@
+
+- DNS_TYPEPAIR_VALUE(RRSIG, T)
++ DNS_SIGTYPE(T)