os: auth: improve readability and robustness of auth proto list

The code is easier to understand, but also more robust (eg. against struct
layout changes) if structs are initialized with explicit field names
instead of as lists.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

os/auth.c

@@ -66,21 +66,28 @@ struct protocol {
 };
 
 static struct protocol protocols[] = {
-    {(unsigned short) 18, "MIT-MAGIC-COOKIE-1",
-     MitAddCookie, MitCheckCookie, MitResetCookie,
-     MitFromID, MitRemoveCookie,
+    {
+        .name_length = 18,
+        .name = "MIT-MAGIC-COOKIE-1",
+        .Add = MitAddCookie,
+        .Check = MitCheckCookie,
+        .Reset = MitResetCookie,
+        .FromID = MitFromID,
+        .Remove = MitRemoveCookie,
 #ifdef XCSECURITY
-     MitGenerateCookie
+        .Generate = MitGenerateCookie
 #endif
-     },
+    },
 #ifdef HASXDMAUTH
-    {(unsigned short) 19, "XDM-AUTHORIZATION-1",
-     XdmAddCookie, XdmCheckCookie, XdmResetCookie,
-     XdmFromID, XdmRemoveCookie,
-#ifdef XCSECURITY
-     NULL
-#endif
-     },
+    {
+        .name_length = 19,
+        .name = "XDM-AUTHORIZATION-1",
+        .Add = XdmAddCookie,
+        .Check = XdmCheckCookie,
+        .Reset = XdmResetCookie,
+        .FromID = XdmFromID,
+        .Remove = XdmRemoveCookie,
+    },
 #endif
 };