If we try to parse a buildstats directory which was either aborted or
is still being built then the top-level build_stats file doesn't
contain an elapsed value which causes an exception:

UnboundLocalError: local variable 'elapsed' referenced before assignment

Default both start and elapsed to 0 so that the parse succeeds.

Signed-off-by: Ross Burton <[email protected]>
---
 scripts/lib/buildstats.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/lib/buildstats.py b/scripts/lib/buildstats.py
index c9a238bb127..9f8c9061505 100644
--- a/scripts/lib/buildstats.py
+++ b/scripts/lib/buildstats.py
@@ -239,6 +239,7 @@ class BuildStats(dict):
         """
         Parse the top-level build_stats file for build-wide start and duration.
         """
+        start = elapsed = 0
         with open(path) as fobj:
             for line in fobj.readlines():
                 key, val = line.split(':', 1)
-- 
2.34.1

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