Base: Fix dangling-else in CHECK_STROP

Follow-up to commit 2527628edae5651cb28e72b2c98f24e72dcdb384.

Bug: 26962895
Bug: 31338270
Test: m
Test: mmma system/core/base && $ANDROID_HOST_OUT/nativetest64/libbase_test/libbase_test64
Change-Id: Ifd71314e146ebf3957cc053ee95ef85002c909b4
2 files changed