config: fix revive linter error

  Error: superfluous-else: if block ends with call to os.Exit function, so drop this else and outdent its block (revive)

Signed-off-by: Roman Khimov <roman@nspcc.ru>

Makefile

@@ -50,8 +50,8 @@ image:
 
 gh-docker-vars:
 	@echo "file=Dockerfile"
-	@echo "version=$(VERSION)"
-	@echo "repo=$(HUB_REPO)"
+	@echo "version=$(HUB_TAG)"
+	@echo "repo=$(HUB_IMAGE)"
 
 # Run tests
 test:

cmd/neofs-oauthz/config.go

@@ -116,10 +116,9 @@ func newConfig() *viper.Viper {
 	if !v.IsSet(cmdConfig) {
 		fmt.Println("config path is mandatory")
 		os.Exit(1)
-	} else {
-		if err := readConfig(v); err != nil {
-			panic(err)
-		}
+	}
+	if err := readConfig(v); err != nil {
+		panic(err)
 	}
 
 	return v