cmd/moncheck - fix missing return value

cmd/moncheck/main.go

@@ -16,7 +16,6 @@ import (
 	"time"
 
 	"git.zero-knowledge.org/gibheer/monzero"
-	"github.com/lib/pq"
 )
 
 var (
@@ -71,13 +70,16 @@ func main() {
 		log.Fatalf("could not resolve hostname: %s", err)
 	}
 
-	checker := monzero.NewChecker(monzero.CheckerConfig{
-		CheckerID:      cfg.CheckerID,
+	checker, err := monzero.NewChecker(monzero.CheckerConfig{
+		CheckerID:      config.CheckerID,
 		DB:             db,
 		Timeout:        timeout,
 		HostIdentifier: hostname,
 		Executor:       monzero.CheckExec,
 	})
+	if err != nil {
+		log.Fatalf("could not create checker instance: %s", err)
+	}
 
 	for i := 0; i < config.Workers; i++ {
 		go check(checker, waitDuration)