Fix nullptr dereference.

If an entry is found in .eh_frame_hdr, but it's not properly in .eh_frame,
then the code would crash. The assumption that the header always points
to valid fde data is not guaranteed.

Bug: 68813077

Test: Passes new unit test that crashed before the change.
Change-Id: I914d9bda0d442cd232e2a056ae490301a8850105