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

Change-Id: I2e27412294b25c62ba061d3adba19bae56da03af