exfat_find(): constify qstr argument

Nothing outside of fs/dcache.c has any business modifying
dentry names; passing &dentry->d_name as an argument should
have that argument declared as a const pointer.

Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/exfat/namei.c

@@ -587,7 +587,7 @@ unlock:
 }
 
 /* lookup a file */
-static int exfat_find(struct inode *dir, struct qstr *qname,
+static int exfat_find(struct inode *dir, const struct qstr *qname,
 		struct exfat_dir_entry *info)
 {
 	int ret, dentry, count;