symtab: fix getting CRC in relocatable modules am: 500c5b7305

Original change: https://android-review.googlesource.com/c/platform/external/libabigail/+/2400497

Change-Id: I4796614eb697b57b60fe3b643b9c3d919170ef24
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>