osd/osd_types: fix the osd_stat_t::decode()

[tchaikov]

should decode the deprecated num_hb_out as vector instead of uint32_t.

it's a regression introduced by 85f22ec

Signed-off-by: Kefu Chai kchai@redhat.com

[tchaikov]

it fixes the failure at https://jenkins.ceph.com/job/ceph-pull-requests/15096/consoleFull#135739626385564bcb-7106-4f52-97ae-4849d9378390

[liupan1111]

@tchaikov thanks! it puzzled me: when encode, i passed in a uint, but why it needs vector when decode?

[tchaikov]

@liupan1111 see encoding.h, b/c vector<> is encoded in two phases,

1. encode an uint32 which is the size of vector
2. the elements

if the size of the vector is 0, apparently we can ignore the second phase. that's why we can ignore the second phase in this case.

[liupan1111]

@tchaikov I see. Thanks!