ext4: remove redundant checking in ext4_ioctl_checkpoint

It is already checked after comment "check for invalid bits set",
so let's remove this one.
Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Link: https://lore.kernel.org/r/20220918115219.12407-1-guoqing.jiang@linux.devSigned-off-by: Theodore Ts'o <tytso@mit.edu>

fs/ext4/ioctl.c

@@ -1063,9 +1063,6 @@ static int ext4_ioctl_checkpoint(struct file *filp, unsigned long arg)
 	if (!EXT4_SB(sb)->s_journal)
 		return -ENODEV;
 
-	if (flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID)
-		return -EINVAL;
-
 	if ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
 	    !bdev_max_discard_sectors(EXT4_SB(sb)->s_journal->j_dev))
 		return -EOPNOTSUPP;