livetree: avoid assertion of orphan phandles with overlays

Right now, check_interrupts_property fails with overlays, as the phandle
for the interrupt-parent can be orphan. Avoid this by allowing the orphan
node to pass the assert check.

The process_checks() call is also moved later during init sequence,
so that we can use the global variable generate_fixups to check if
we are compiling an overlay.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
[dwg: Shortcut handling of invalid phandles]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

dtc.c

@@ -317,13 +317,14 @@ int main(int argc, char *argv[])
 		dti->boot_cpuid_phys = cmdline_boot_cpuid;
 
 	fill_fullpaths(dti->dt, "");
-	process_checks(force, dti);
 
 	/* on a plugin, generate by default */
 	if (dti->dtsflags & DTSF_PLUGIN) {
 		generate_fixups = 1;
 	}
 
+	process_checks(force, dti);
+
 	if (auto_label_aliases)
 		generate_label_tree(dti, "aliases", false);
 

livetree.c

@@ -540,7 +540,10 @@ struct node *get_node_by_phandle(struct node *tree, cell_t phandle)
 {
 	struct node *child, *node;
 
-	assert((phandle != 0) && (phandle != -1));
+	if ((phandle == 0) || (phandle == -1)) {
+		assert(generate_fixups);
+		return NULL;
+	}
 
 	if (tree->phandle == phandle) {
 		if (tree->deleted)