scripts, test: replace exit() with sys.exit()

exit() is provided by the site module for interactive use.
Use sys.exit() which is the proper way to exit from scripts.

Assisted-by: Claude Code (claude-opus-4-6)
Signed-off-by: Adrian Reber <areber@redhat.com>

scripts/github-indent-warnings.py

@@ -9,7 +9,7 @@ if __name__ == '__main__':
     if len(sys.argv) != 1 and len(sys.argv) != 2:
         print(f'usage: {sys.argv[0]} <path/to/file>')
         print(f'usage: <command> | {sys.argv[0]}')
-        exit(1)
+        sys.exit(1)
 
     input_file = sys.stdin.fileno()
     if len(sys.argv) == 2:

scripts/magic-gen.py

@@ -7,7 +7,7 @@ import sys
 def main(argv):
     if len(argv) != 3:
         print("Usage: magic-gen.py path/to/image.h path/to/magic.py")
-        exit(1)
+        sys.exit(1)
 
     magic_c_header = argv[1]
     magic_py = argv[2]

test/others/criu-ns/run.py

@@ -38,7 +38,7 @@ def run_task_with_own_pty(task):
         fcntl.ioctl(fd_s, termios.TIOCSCTTY, 1)
         os.close(fd_s)
         task()
-        exit(0)
+        sys.exit(0)
 
     os.close(fd_s)
     fd_m = os.fdopen(fd_m, "rb")
@@ -65,7 +65,7 @@ def run_task_with_own_pty(task):
 
     if status != 0:
         print("task %s exited badly: %d" % (task.__name__, status))
-        exit(1)
+        sys.exit(1)
 
     return 0