db mismatch (including patch mismatch) should be an error

servers/slapd/back-bdb/init.c

@@ -507,12 +507,14 @@ bdb_back_initialize(
 #endif
 
 		ver = (major << 24) | (minor << 16) | patch;
-		if( ver < DB_VERSION_FULL ) {
-			Debug( LDAP_DEBUG_TRACE,
+		if( ver != DB_VERSION_FULL ) {
+			/* fail if a versions don't match */
+			Debug( LDAP_DEBUG_ANY,
 				LDAP_XSTRING(bdb_back_initialize) ": "
 				"BDB library version mismatch:"
 				" expected " DB_VERSION_STRING ","
 				" got %s\n", version, 0, 0 );
+			return -1;
 		}
 
 		Debug( LDAP_DEBUG_TRACE, LDAP_XSTRING(bdb_back_initialize)