tests: Adjust testsuite return codes to automake guidelines

As per the manual[1]:

"When no test protocol is in use, an exit status of 0 from a test script
will denote a success, an exit status of 77 a skipped test, an exit
status of 99 a hard error, and any other exit status will denote a
failure."

[1] https://www.gnu.org/software/automake/manual/html_node/Scripts_002dbased-Testsuites.html

Signed-off-by: Phil Sutter <phil@nwl.cc>

1 files changed, 1 insertions, 1 deletions

diff --git a/xlate-test.py b/xlate-test.py
index 4f037ef6..4cb1401b 100755
--- a/xlate-test.py
+++ b/xlate-test.py
@@ -250,7 +250,7 @@ def main():
                 tests, passed, failed, errors = run_test(args.test, payload)
         except IOError:
             print(red("Error: ") + "test file does not exist", file=sys.stderr)
-            return -1
+            return 99
     else:
         files, tests, passed, failed, errors = load_test_files()