sbus: display7seg: Use of_property_read_bool() for boolean properties

It is preferred to use typed property access functions (i.e.
of_property_read_<type> functions) rather than low-level
of_get_property/of_find_property functions for reading properties.
Convert reading boolean properties to to of_property_read_bool().

Link: https://lore.kernel.org/r/20230310144723.1544930-1-robh@kernel.orgSigned-off-by: Rob Herring <robh@kernel.org>

drivers/sbus/char/display7seg.c

@@ -200,9 +200,8 @@ static int d7s_probe(struct platform_device *op)
 	 */
 	regs = readb(p->regs);
 	opts = of_find_node_by_path("/options");
-	if (opts &&
-	    of_get_property(opts, "d7s-flipped?", NULL))
-		p->flipped = true;
+	if (opts)
+	    p->flipped = of_property_read_bool(opts, "d7s-flipped?");
 
 	if (p->flipped)
 		regs |= D7S_FLIP;