dtc: Simplify error handling for unparseable input

Currently, main() tests if it got a valid input tree from whichever
dt_from_*() function it invoked and if not, die()s.  For one thing,
this test has, for no good reason, three different ways for those
functions to communicate a failure to provide input (bi NULL, bi->dt
NULL, or bi->error non-zero).  For another, in every case save one, if
the dt_from_*() functions are unable to provide input they will
immediately die() (with a more specific error message) rather than
proceeding to the test in main().

Therefore, this patch removes this test, making the one case that
could have triggered it (in dt_from_source()) call die() directly
instead.  With this change, the error field in struct boot_info is now
unused, so remove it.

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

1 files changed, 4 insertions, 2 deletions

diff --git a/treesource.c b/treesource.c
index 3c24e7f..468d6b1 100644
--- a/treesource.c
+++ b/treesource.c
@@ -36,9 +36,11 @@ struct boot_info *dt_from_source(const char *fname)
 	yyin = srcpos_file->file;
 
 	if (yyparse() != 0)
-		return NULL;
+		die("Unable to parse input tree\n");
+
+	if (treesource_error)
+		die("Syntax error parsing input tree\n");
 
-	the_boot_info->error = treesource_error;
 	return the_boot_info;
 }