do_mpage_readpage(): remove useless clear_buffer_mapped() call

It is known that buffer_mapped() is false in this code path.

Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/mpage.c b/fs/mpage.c
index 46e977e..16c3ef3 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -241,7 +241,6 @@
 				first_hole = page_block;
 			page_block++;
 			block_in_file++;
-			clear_buffer_mapped(map_bh);
 			continue;
 		}