[PATCH] unexport clear_page_dirty_for_io

I didn't find any possible modular usage in the kernel.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/page-writeback.c

@@ -750,7 +750,6 @@ int clear_page_dirty_for_io(struct page *page)
 	}
 	return TestClearPageDirty(page);
 }
-EXPORT_SYMBOL(clear_page_dirty_for_io);
 
 int test_clear_page_writeback(struct page *page)
 {