api: fix crash in vl_msg_api_free
api: fix crash in vl_msg_api_free

VPP crash when ASSERT in clib_mem_free.

Type: fix

Signed-off-by: wanghanlin <2a7ca241eb4a7ff06d4307cab23ef63455935ec6@corp.netease.com>
Change-Id: Id06d833caab3385446528d62a6ed3bde38d57db0

FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp