block: use bdrv_co_getlength in coroutine context

bdrv_co_getlength was recently introduced, with bdrv_getlength becoming
a wrapper for use in unknown context.  Switch to bdrv_co_getlength when
possible.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20230601115145.196465-12-pbonzini@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
4 files changed