dtc: Add testcases for tree checks

This patch adds a group of testcases to check that dtc correctly
rejects trees with various structural errors.

To make things easier to test, we change dtc so that failing checks
(as opposed to other errors) result in exit code 2.

This patch also fixes an embarrasing bug uncovered by these new tests:
check_phandles() worked out if the tree's phandles were valid, then
throws that information away and returns success always.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 1 insertions, 1 deletions

diff --git a/dtc.c b/dtc.c
index bbef829..602b296 100644
--- a/dtc.c
+++ b/dtc.c
@@ -197,7 +197,7 @@ int main(int argc, char *argv[])
 	if (!structure_ok) {
 		if (!force) {
 			fprintf(stderr, "ERROR: Input tree has structural errors, aborting (use -f to force output)\n");
-			exit(1);
+			exit(2);
 		} else if (quiet < 3) {
 			fprintf(stderr, "Warning: Input tree has structural errors, output forced\n");
 		}