crypto: simplify assertions in Safe*Print

Checking the X509V3_EXT_METHOD doesn't do anything. X509V3_EXT_get is
already implemented by calling X509V3_EXT_get_nid on the extension's
NID. We may as well just check the NID directly.

src/crypto/crypto_common.cc

@@ -815,8 +815,7 @@ static bool PrintGeneralName(const BIOPointer& out, const GENERAL_NAME* gen) {
 }
 
 bool SafeX509SubjectAltNamePrint(const BIOPointer& out, X509_EXTENSION* ext) {
-  const X509V3_EXT_METHOD* method = X509V3_EXT_get(ext);
-  CHECK(method == X509V3_EXT_get_nid(NID_subject_alt_name));
+  CHECK_EQ(OBJ_obj2nid(X509_EXTENSION_get_object(ext)), NID_subject_alt_name);
 
   GENERAL_NAMES* names = static_cast<GENERAL_NAMES*>(X509V3_EXT_d2i(ext));
   if (names == nullptr)
@@ -840,8 +839,7 @@ bool SafeX509SubjectAltNamePrint(const BIOPointer& out, X509_EXTENSION* ext) {
 }
 
 bool SafeX509InfoAccessPrint(const BIOPointer& out, X509_EXTENSION* ext) {
-  const X509V3_EXT_METHOD* method = X509V3_EXT_get(ext);
-  CHECK(method == X509V3_EXT_get_nid(NID_info_access));
+  CHECK_EQ(OBJ_obj2nid(X509_EXTENSION_get_object(ext)), NID_info_access);
 
   AUTHORITY_INFO_ACCESS* descs =
       static_cast<AUTHORITY_INFO_ACCESS*>(X509V3_EXT_d2i(ext));