f2fs: move i_size_write in f2fs_write_end

We don't need to do i_size_write under page lock.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/data.c

@@ -1685,11 +1685,11 @@ static int f2fs_write_end(struct file *file,
 	trace_f2fs_write_end(inode, pos, len, copied);
 
 	set_page_dirty(page);
+	f2fs_put_page(page, 1);
 
 	if (pos + copied > i_size_read(inode))
 		f2fs_i_size_write(inode, pos + copied);
 
-	f2fs_put_page(page, 1);
 	f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
 	return copied;
 }