w1: Constify struct w1_family_ops

The fops field in the w1_family struct is never modified. Make it const
to indicate that. Constifying the pointer makes it possible for drivers
to declare static w1_family_ops structs const, which in turn will allow
the compiler to put it in read-only memory.

Reviewed-by: Sebastian Reichel <[e-mail]>
Signed-off-by: Rikard Falkeborn <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/w1/w1.c

···
 
 static int w1_family_notify(unsigned long action, struct w1_slave *sl)
 {
-	struct w1_family_ops *fops;
+	const struct w1_family_ops *fops;
 	int err;
 
 	fops = sl->family->fops;

include/linux/w1.h

···
 	struct list_head	family_entry;
 	u8			fid;
 
-	struct w1_family_ops	*fops;
+	const struct w1_family_ops *fops;
 
 	const struct of_device_id *of_match_table;