[FAB-7675] fix make verify
[FAB-7675] fix make verify

The refactor done in FAB-7649 inverted the match for go files in the
packages_diff function. This corrects the behavior and removes an
unnecessary local variable.

Change-Id: I4aba1aef7fb0775f8b73484c1960c41e01ba3967
Signed-off-by: Matthew Sykes <89c6e4c9c1046731a9c37abefc223a83de36a5d9@us.ibm.com>

stemlending/fabric,xixuejia/fabric,manish-sethi/fabric,lukehuangch/fabric,lukehuangch/fabric,jimthematrix/fabric,stemlending/fabric,lukehuangch/fabric,manish-sethi/fabric-sidedb,binhn/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,stemlending/fabric,ckeyer/fabric,ckeyer/fabric,muralisrini/fabric,manish-sethi/fabric,stemlending/fabric,binhn/fabric,lukehuangch/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,xixuejia/fabric,ckeyer/fabric,hyperledger/fabric,ckeyer/fabric,manish-sethi/fabric-sidedb,hyperledger/fabric,ckeyer/fabric,lukehuangch/fabric,muralisrini/fabric,xixuejia/fabric,manish-sethi/fabric-sidedb,ckeyer/fabric,lukehuangch/fabric,jimthematrix/fabric,muralisrini/fabric,binhn/fabric,ckeyer/fabric,lukehuangch/fabric