glsl: Use typed foreach_in_list_safe instead of foreach_list_safe.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/glsl/opt_array_splitting.cpp

@@ -223,9 +223,7 @@ ir_array_reference_visitor::get_split_list(exec_list *instructions,
    }
 
    /* Trim out variables we found that we can't split. */
-   foreach_list_safe(n, &variable_list) {
-      variable_entry *entry = (variable_entry *) n;
-
+   foreach_in_list_safe(variable_entry, entry, &variable_list) {
       if (debug) {
 	 printf("array %s@%p: decl %d, split %d\n",
 		entry->var->name, (void *) entry->var, entry->declaration,