pinctrl: sirf: Use common error handling code in sirfsoc_dt_node_to_map()

[SF Markus Elfring]

>> Add a jump target so that a bit of exception handling can be better reused
>> at the end of this function.
>>
>> This issue was detected by using the Coccinelle software.
> 
> Does Coccinelle have a threshold for how much cleanup can be shared?

Are you looking for a limitation of such source code search patterns?

Regards,
Markus