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Coverity detects dereferencing a pointer that might be "NULL" when calling acpigen_write_scope. Add sanity check for scope to prevent NULL pointer dereference. Found-by: Coverity CID 1420207 Signed-off-by: John Zhao <john.zhao@intel.com> Change-Id: Icc253c63aadef1c0ecb116a38b608f64f80abc79 Reviewed-on: https://review.coreboot.org/c/coreboot/+/42839 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com> Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>