vmxnet3: memory leak on parsing bad CLI command
vmxnet3: memory leak on parsing bad CLI command

When parsing bad "create interface vmxnet3" command, we should call
unformat_free prior to return

Type: fix
Fixes: df7f8e8cffcc43531f7daeda44d436b60e538141

Signed-off-by: Steven Luong <a748ea44ad7b179c2313a856d44e1e4eb39869bb@cisco.com>
Change-Id: I2663894c6cb8066ca2abb1c56f0ca46d0fef19f7

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