slimbus: core: Constify slim_eaddr_equal()

bool slim_eaddr_equal(struct slim_eaddr *a, struct slim_eaddr *b)
does not modify @*a or @*b.

To prepare for constifying API device_find_child() later.

Constify this comparison function by simply changing its
parameter type to 'const struct slim_eaddr *'.

Reviewed-by: Jonathan Cameron <[e-mail]>
Signed-off-by: Zijun Hu <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/slimbus/core.c

···
 }
 EXPORT_SYMBOL_GPL(slim_report_absent);
 
-static bool slim_eaddr_equal(struct slim_eaddr *a, struct slim_eaddr *b)
+static bool slim_eaddr_equal(const struct slim_eaddr *a,
+			     const struct slim_eaddr *b)
 {
 	return (a->manf_id == b->manf_id &&
 		a->prod_code == b->prod_code &&