sr: Fix the coverity issue on srv6-mobile plugin
sr: Fix the coverity issue on srv6-mobile plugin

Type: fix

Signed-off-by: Tetsuya Murakami <a47d6630afda28b3ec4a7f74049e69081014db0a@gmail.com>
Change-Id: I55e6d7dd193f83f70d27e27fe2e383939d677ef1

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