Fix DexFile::GetChecksum to work on plain .dex files
Fix DexFile::GetChecksum to work on plain .dex files

Change-Id: I8947e0288378a1cc31fd8e60dad0bf25a76cfd1e

treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst