oatdump: Fix oat code retrieval.

Test: m dump-oat-boot
Bug: 132685275

(cherry picked from commit e00e20103fe798669b69de79e161650908659d05)

Change-Id: I9d11fc494f704a57603ca3e017dcb778e9d8eeaf
Merged-In: I151969ad6ac6bd7a8dce6c7427478cdde369bfd0
1 file changed