[PATCH pciutils 4/4] lspci: Do not show -[00]- bus in tree output

["Pali Rohár" <pali@kernel.org>]

Secondary or subordinate bus cannot be zero. Zero value could indicate
either invalid secondary bus value or the fact that secondary bus value was
not filled or indicates non-compliant PCI-to-PCI bridge. This change makes
tree output better readable when bus numbers are not known or not provided.
---
 ls-tree.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/ls-tree.c b/ls-tree.c
index fede581156e4..f8154a2b034a 100644
--- a/ls-tree.c
+++ b/ls-tree.c
@@ -258,7 +258,9 @@ show_tree_dev(struct device *d, char *line, char *p)
   for (b=&host_bridge; b; b=b->chain)
     if (b->br_dev == d)
       {
-	if (b->secondary == b->subordinate)
+	if (b->secondary == 0)
+	  p = tree_printf(line, p, "-");
+	else if (b->secondary == b->subordinate)
 	  p = tree_printf(line, p, "-[%02x]-", b->secondary);
 	else
 	  p = tree_printf(line, p, "-[%02x-%02x]-", b->secondary, b->subordinate);
-- 
2.20.1