miinitext: drop sentinel detection during LoadExtension

All the sentinels from the extension lists were removed, thus the only
case were this would trigger is when the code is broken badly.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Keith Packard <keithp@keithp.com>

mi/miinitext.c

@@ -369,9 +369,6 @@ LoadExtension(const ExtensionModule * e, Bool builtin)
 {
     ExtensionModule *newext;
 
-    if (e == NULL || e->name == NULL)
-        return;
-
     /* Make sure built-in extensions get added to the list before those
      * in modules. */
     AddStaticExtensions();