apf: Fix bound-checking to allow accessing the last data byte.

Bug: 73804303
Test: runtest -x frameworks/base/tests/net/java/android/net/apf/ApfTest.java
Merged-In: I3543eedac5998d6a1b16010b5dc8865e9cc24b5b
Change-Id: I3543eedac5998d6a1b16010b5dc8865e9cc24b5b
(cherry picked from commit 7024456a1fb07f0a88ed8dbeeba41c21a4a40304)
1 file changed