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[ Upstream commit857ae05549] In the spirit of commit91751e2482("vsock: prevent null-ptr-deref in vsock_*[has_data|has_space]"), armorize the "impossible" cases with a warning. Fixes:634f1a7110("vsock: support sockmap") Signed-off-by: Michal Luczaj <mhal@rbox.co> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>