[PATCH] Fix wrong CONFIG_* in comment

Our tools are somewhat too stupid.  They find a mistyped CONFIG_HIGMEM
(missing 'H') and assume a dependency on config/higmem.h. Fix the comment.

include/linux/mm.h

@@ -196,7 +196,7 @@ struct page {
 #if defined(WANT_PAGE_VIRTUAL)
 	void *virtual;			/* Kernel virtual address (NULL if
 					   not kmapped, ie. highmem) */
-#endif /* CONFIG_HIGMEM || WANT_PAGE_VIRTUAL */
+#endif /* CONFIG_HIGHMEM || WANT_PAGE_VIRTUAL */
 };
 
 /*