[PATCH 1/4] scripts/lib/kdoc/kdoc_files.py: don't try to join None

[Mauro Carvalho Chehab]

If out_msg() returns None, it means that an unknown declaration
was found. Avoid letting the script crash on such case.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
---
 scripts/lib/kdoc/kdoc_files.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/scripts/lib/kdoc/kdoc_files.py b/scripts/lib/kdoc/kdoc_files.py
index dd003feefd1b..2e51e5f3bb77 100644
--- a/scripts/lib/kdoc/kdoc_files.py
+++ b/scripts/lib/kdoc/kdoc_files.py
@@ -270,13 +270,16 @@ class KernelFiles():
 
             msg = ""
             for name, arg in self.results[fname]:
-                msg += self.out_msg(fname, name, arg)
+                m = self.out_msg(fname, name, arg)
 
-                if msg is None:
+                if m is None:
                     ln = arg.get("ln", 0)
                     dtype = arg.get('type', "")
 
                     self.config.log.warning("%s:%d Can't handle %s",
                                             fname, ln, dtype)
+                else:
+                    msg += m
+
             if msg:
                 yield fname, msg
-- 
2.49.0