Add OF_prop_free function as a counterpart for OF_*prop_alloc

- Introduce new OF API function OF_prop_free to free memory allocated by
  OF_getprop_alloc and OF_getencprop_alloc. Current code just calls free(9)
  with M_OFWPROP memory class which assumes knowledge about OF_*prop_alloc
  functions' internals and leads to unneccessary code coupling

- Convert some of the free(..., M_OFWPROP) instances to OF_prop_free

Files affected by this commit are the ones I was able to test on real
hardware. The rest of free(..., M_OFWPROP) instances will be handled with
idividual maintainers

Reviewed by:	andrew
Differential Revision:	https://reviews.freebsd.org/D6315

1 files changed, 3 insertions, 3 deletions

diff --git a/sys/arm/broadcom/bcm2835/bcm2835_gpio.c b/sys/arm/broadcom/bcm2835/bcm2835_gpio.c
index 9619503..cab3116 100644
--- a/sys/arm/broadcom/bcm2835/bcm2835_gpio.c
+++ b/sys/arm/broadcom/bcm2835/bcm2835_gpio.c
@@ -632,7 +632,7 @@ bcm_gpio_get_ro_pins(struct bcm_gpio_softc *sc, phandle_t node,
 	if (npins < 0)
 		return (-1);
 	if (npins == 0) {
-		free(pins, M_OFWPROP);
+		OF_prop_free(pins);
 		return (0);
 	}
 	for (i = 0; i < npins; i++)
@@ -660,7 +660,7 @@ bcm_gpio_get_ro_pins(struct bcm_gpio_softc *sc, phandle_t node,
 		printf("%d-%d.\n", range_start, range_stop);
 	else
 		printf("%d.\n", range_start);
-	free(pins, M_OFWPROP);
+	OF_prop_free(pins);
 
 	return (0);
 }
@@ -686,7 +686,7 @@ bcm_gpio_get_reserved_pins(struct bcm_gpio_softc *sc)
 			return (-1);
 		if (strcmp(name, "reserved") == 0)
 			reserved = node;
-		free(name, M_OFWPROP);
+		OF_prop_free(name);
 		node = OF_peer(node);
 	}
 	if (reserved == 0)