drm/mm: Use helpers for drm_mm_node booleans

In preparation for rearranging the booleans into a flags field, ensure
all the current users are using the inline helpers and not directly
accessing the members.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191003210100.22250-3-chris@chris-wilson.co.uk

drivers/gpu/drm/selftests/test-drm_mm.c

@@ -854,7 +854,7 @@ static bool assert_contiguous_in_range(struct drm_mm *mm,
 
 	if (start > 0) {
 		node = __drm_mm_interval_first(mm, 0, start - 1);
-		if (node->allocated) {
+		if (drm_mm_node_allocated(node)) {
 			pr_err("node before start: node=%llx+%llu, start=%llx\n",
 			       node->start, node->size, start);
 			return false;
@@ -863,7 +863,7 @@ static bool assert_contiguous_in_range(struct drm_mm *mm,
 
 	if (end < U64_MAX) {
 		node = __drm_mm_interval_first(mm, end, U64_MAX);
-		if (node->allocated) {
+		if (drm_mm_node_allocated(node)) {
 			pr_err("node after end: node=%llx+%llu, end=%llx\n",
 			       node->start, node->size, end);
 			return false;
@@ -1156,12 +1156,12 @@ static void show_holes(const struct drm_mm *mm, int count)
 		struct drm_mm_node *next = list_next_entry(hole, node_list);
 		const char *node1 = NULL, *node2 = NULL;
 
-		if (hole->allocated)
+		if (drm_mm_node_allocated(hole))
 			node1 = kasprintf(GFP_KERNEL,
 					  "[%llx + %lld, color=%ld], ",
 					  hole->start, hole->size, hole->color);
 
-		if (next->allocated)
+		if (drm_mm_node_allocated(next))
 			node2 = kasprintf(GFP_KERNEL,
 					  ", [%llx + %lld, color=%ld]",
 					  next->start, next->size, next->color);
@@ -1900,18 +1900,18 @@ static void separate_adjacent_colors(const struct drm_mm_node *node,
 				     u64 *start,
 				     u64 *end)
 {
-	if (node->allocated && node->color != color)
+	if (drm_mm_node_allocated(node) && node->color != color)
 		++*start;
 
 	node = list_next_entry(node, node_list);
-	if (node->allocated && node->color != color)
+	if (drm_mm_node_allocated(node) && node->color != color)
 		--*end;
 }
 
 static bool colors_abutt(const struct drm_mm_node *node)
 {
 	if (!drm_mm_hole_follows(node) &&
-	    list_next_entry(node, node_list)->allocated) {
+	    drm_mm_node_allocated(list_next_entry(node, node_list))) {
 		pr_err("colors abutt; %ld [%llx + %llx] is next to %ld [%llx + %llx]!\n",
 		       node->color, node->start, node->size,
 		       list_next_entry(node, node_list)->color,