cp: simplify GCC pacification

* src/cp.c (make_dir_parents_private): Remove IF_LINT code that is
no longer needed, as GCC has apparently gotten smarter since 2008.

src/cp.c

@@ -404,7 +404,7 @@ make_dir_parents_private (char const *const_dir, size_t src_offset,
 
       while ((slash = strchr (slash, '/')))
         {
-          struct dir_attr *new IF_LINT ( = NULL);
+          struct dir_attr *new;
           bool missing_dir;
 
           *slash = '\0';