Have tests read example tree from a generated file, rather than link it in.

This makes the tests more flexible to re-use for testing the output from
the write tests.

tests/dumptrees.c

@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include <fdt.h>
+
+#include "tests.h"
+#include "testdata.h"
+
+struct {
+	struct fdt_header *fdt;
+	const char *filename;
+} trees[] = {
+#define TREE(name)	{ &_##name, #name ".dtb" }
+	TREE(test_tree1),
+};
+
+#define NUM_TREES	(sizeof(trees) / sizeof(trees[0]))
+
+int main(int argc, char *argv[])
+{
+	int i;
+
+	for (i = 0; i < NUM_TREES; i++) {
+		struct fdt_header *fdt = trees[i].fdt;
+		const char *filename = trees[i].filename;
+		int size;
+		int fd;
+		int ret;
+
+		size = fdt32_to_cpu(fdt->totalsize);
+
+		printf("Tree \"%s\", %d bytes\n", filename, size);
+
+		fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
+		if (fd < 0)
+			perror("open()");
+
+		ret = write(fd, fdt, size);
+		if (ret != size)
+			perror("write()");
+
+		close(fd);
+	}
+	exit(0);
+}