* som.c (som_slurp_string_table): Use malloc to allocate space

    * som.c (som_slurp_string_table): Use malloc to allocate space
        for the cached copy of the native string table.
        (som_slurp_symbol_table): Likewise for the native symbol table.
        (som_slurp_reloc_table): Likewise for the native and generic
        relocation tables.
        (som_bfd_free_cached_info): Free the cached native strings,
        symbols, and relocations.  Also free the canonical cached relocations.