Fix an OOB bug in parse_gap_data

Bug: 277590580
bug: 275553827
Test: atest net_test_main_shim
Ignore-AOSP-First: security
Tag: #security
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:0d7e3d8fd96389f1435b76f37064c69ae61df6e7)
Merged-In: I7fcb7c46f668f48560a72399a3c5087c6da3827f
Change-Id: I7fcb7c46f668f48560a72399a3c5087c6da3827f