ext4: use min() to make code cleaner

Use min() in order to make code cleaner.

Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Changcheng Deng <deng.changcheng@zte.com.cn>

fs/ext4/super.c

@@ -6923,8 +6923,7 @@ static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
 		len = i_size-off;
 	toread = len;
 	while (toread > 0) {
-		tocopy = sb->s_blocksize - offset < toread ?
-				sb->s_blocksize - offset : toread;
+		tocopy = min(sb->s_blocksize - offset, toread);
 		bh = ext4_bread(NULL, inode, blk, 0);
 		if (IS_ERR(bh))
 			return PTR_ERR(bh);