[scudo] Fix String DCHECK am: 02efe40f26 am: f0a848d25a am: efd3866a2c am: b42ef1d927

Original change: https://android-review.googlesource.com/c/platform/external/scudo/+/1729755

Change-Id: I91f8215e60383c1a85d20bb365c9cef553faad01