f2fs: fix to clear GCed flag for atomic written page

Atomic write page can be GCed, after committing this kind of page, we should
clear the GCed flag for it.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 7efd96ad..f77b325 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -253,6 +253,7 @@
 					unlock_page(cur->page);
 					break;
 				}
+				clear_cold_data(cur->page);
 				submit_bio = true;
 			}
 		} else {