i2c: pxa: don't error out if there's no pinctrl

The bus recovery patch regresses on OLPC XO-1.75 that has no pinctrl in
its DT.

Fixes: 7c9ec2c5 ("i2c: pxa: implement generic i2c bus recovery")'
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-pxa.c

@@ -1348,6 +1348,8 @@ static int i2c_pxa_init_recovery(struct pxa_i2c *i2c)
 		return 0;
 
 	i2c->pinctrl = devm_pinctrl_get(dev);
+	if (PTR_ERR(i2c->pinctrl) == -ENODEV)
+		i2c->pinctrl = NULL;
 	if (IS_ERR(i2c->pinctrl))
 		return PTR_ERR(i2c->pinctrl);