Fix handling of invalid alias property values. Bug: 246194233 Test: mmma system/libufdt && system/libufdt/tests/run_tests.sh Test: mmma system/libufdt && system/libufdt/tests/run_performance_test.sh Test: test with fuzzer case Test: run fuzzer to check coverage beyond added checks Ignore-AOSP-First: Security Change-Id: I229cd2ff97a1bea807fdb9d0f4642af5219fc0af (cherry picked from commit 7c57a20a9c74216fece757537f5d4e9115b3a904)