vmxnet3: remove asserts that confuse coverity
vmxnet3: remove asserts that confuse coverity

These asserts are only for debugging and never fired during
any testing, but they confuse coverity's null tracking.

Signed-off-by: Stephen Hemminger <06fa905d7f2aaced6dc72e9511c71a2a51e8aead@networkplumber.org>
Acked-by: Yong Wang <0cd1be787884a033c98e298059e386114d22793e@vmware.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk