scripts: dts: gen_defines: Fix issue if there are no compats
We get the following error:
ValueError: max() arg is an empty sequence
if the compatiable section of the device tree is empty or doesn't exist.
Fix this by havingin max_len get a default value of 0.
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
diff --git a/scripts/dts/gen_defines.py b/scripts/dts/gen_defines.py
index ac46b18..6b86ec5 100755
--- a/scripts/dts/gen_defines.py
+++ b/scripts/dts/gen_defines.py
@@ -505,7 +505,7 @@
for name, node in edt.chosen_nodes.items():
chosen[f"DT_CHOSEN_{str2ident(name)}"] = f"DT_{node.z_path_id}"
chosen[f"DT_CHOSEN_{str2ident(name)}_EXISTS"] = 1
- max_len = max(map(len, chosen))
+ max_len = max(map(len, chosen), default=0)
for macro, value in chosen.items():
out_define(macro, value, width=max_len)
