vfs: remove superflous sb == NULL checks

inode->i_sb is always set, not need to check for it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/inode.c

@@ -250,7 +250,7 @@ void clear_inode(struct inode *inode)
 	BUG_ON(inode->i_state & I_CLEAR);
 	wait_on_inode(inode);
 	DQUOT_DROP(inode);
-	if (inode->i_sb && inode->i_sb->s_op->clear_inode)
+	if (inode->i_sb->s_op->clear_inode)
 		inode->i_sb->s_op->clear_inode(inode);
 	if (S_ISBLK(inode->i_mode) && inode->i_bdev)
 		bd_forget(inode);
@@ -1040,7 +1040,7 @@ static void generic_forget_inode(struct inode *inode)
 		if (!(inode->i_state & (I_DIRTY|I_LOCK)))
 			list_move(&inode->i_list, &inode_unused);
 		inodes_stat.nr_unused++;
-		if (!sb || (sb->s_flags & MS_ACTIVE)) {
+		if (sb->s_flags & MS_ACTIVE) {
 			spin_unlock(&inode_lock);
 			return;
 		}

fs/ioctl.c

@@ -67,8 +67,6 @@ static int file_ioctl(struct file *filp, unsigned int cmd,
 			return put_user(res, p);
 		}
 		case FIGETBSZ:
-			if (inode->i_sb == NULL)
-				return -EBADF;
 			return put_user(inode->i_sb->s_blocksize, p);
 		case FIONREAD:
 			return put_user(i_size_read(inode) - filp->f_pos, p);