f2fs: should unset atomic flag after successful commit

If there is an error during commit, we should keep the flag in order to
abort it.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/file.c

@@ -1378,8 +1378,10 @@ static int f2fs_ioc_commit_atomic_write(struct file *filp)
 	if (f2fs_is_atomic_file(inode)) {
 		clear_inode_flag(F2FS_I(inode), FI_ATOMIC_FILE);
 		ret = commit_inmem_pages(inode, false);
-		if (ret)
+		if (ret) {
+			set_inode_flag(F2FS_I(inode), FI_ATOMIC_FILE);
 			goto err_out;
+		}
 	}
 
 	ret = f2fs_sync_file(filp, 0, LLONG_MAX, 0);