f2fs: cleanup redundant macro

We've already made fi and sbi for inode. Let's avoid duplicated work.
Signed-off-by: NChangman Lee <cm224.lee@samsung.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/file.c

@@ -206,10 +206,10 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
 		ret = f2fs_sync_fs(inode->i_sb, 1);
 
 		down_write(&fi->i_sem);
-		F2FS_I(inode)->xattr_ver = 0;
+		fi->xattr_ver = 0;
 		if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
 					get_parent_ino(inode, &pino)) {
-			F2FS_I(inode)->i_pino = pino;
+			fi->i_pino = pino;
 			file_got_pino(inode);
 			up_write(&fi->i_sem);
 			mark_inode_dirty_sync(inode);
@@ -241,7 +241,7 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
 flush_out:
 		remove_dirty_inode(sbi, ino, UPDATE_INO);
 		clear_inode_flag(fi, FI_UPDATE_WRITE);
-		ret = f2fs_issue_flush(F2FS_I_SB(inode));
+		ret = f2fs_issue_flush(sbi);
 	}
 out:
 	trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);