libfdt: Fix a few typos

Fix 'saftey' and 'additional' typos noticed in the assumption series.
Reword the ASSUME_NO_ROLLBACK slightly to improve clarity.

Signed-off-by: Simon Glass <[email protected]>
Suggested-by: David Gibson <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: David Gibson <[email protected]>
1 file changed