test/shell-job: remove unreachable sys.exit()

The sys.exit(1) after a while True loop can never be reached.

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

test/others/shell-job/run.py

@@ -35,7 +35,6 @@ if pid == 0:
         if not os.access("running", os.F_OK):
             sys.exit(0)
         time.sleep(1)
-    sys.exit(1)
 
 pw.close()
 pr.read(1)