gpio-uclass: fix off-by-one in gpio_request_list_by_name_nodev()

By the time we jump to the err label, count represents the number of
gpios we've successfully requested. So by subtracting one, we fail to
free the most recently requested.

Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/gpio/gpio-uclass.c

@@ -1219,7 +1219,7 @@ int gpio_request_list_by_name_nodev(ofnode node, const char *list_name,
 	return count;
 
 err:
-	gpio_free_list_nodev(desc, count - 1);
+	gpio_free_list_nodev(desc, count);
 
 	return ret;
 }