dump: simplify get_len_buf_out()

dump: simplify get_len_buf_out()

We can (and should) rely on the fact that s->flag_compress is exactly one
of DUMP_DH_COMPRESSED_ZLIB, DUMP_DH_COMPRESSED_LZO, and
DUMP_DH_COMPRESSED_SNAPPY.

This is ensured by the QMP schema and dump_init() in combination.

Suggested-by: Paolo Bonzini <[email protected]>
Signed-off-by: Laszlo Ersek <[email protected]>
Reviewed-by: Paolo Bonzini <[email protected]>
Signed-off-by: Luiz Capitulino <[email protected]>