[automerger] libbinder: readCString: no ubsan sub-overflow am: d0d4b584fc am: a7134ad559 am: 7e71b6ee21 am: 2537a8b5b6 am: 85c1e41520 am: 6658f2faec am: a9d88cd608
am: 9d5523b8f5

Change-Id: I80614ce8e9ac7fa07938668a063a310144e863c6