[PATCH] mm/page-writeback.c: remove an unused function

This patch removes an unused global function.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/page-flags.h

@@ -308,7 +308,6 @@ extern void __mod_page_state(unsigned offset, unsigned long delta);
 struct page;	/* forward declaration */
 
 int test_clear_page_dirty(struct page *page);
-int __clear_page_dirty(struct page *page);
 int test_clear_page_writeback(struct page *page);
 int test_set_page_writeback(struct page *page);