libdw: Initialize variables in getcfi_gnu_eh_frame.

Some older GCCs are not clever enough to realize that when search_table
is NULL not only are search_table_entries and search_table_encoding not
initialized, they are also not used. Giving "may be used uninitialized"
errors.

Signed-off-by: Mark Wielaard <mjw@redhat.com>
2 files changed