revert main.go and fix linting for unused variable

main.go

@@ -1,22 +1,11 @@
 package main
 
 import (
-	"flag"
-
 	"github.com/hashicorp/terraform-plugin-sdk/v2/plugin"
 	"github.com/terraform-providers/terraform-provider-postgresql/postgresql"
 )
 
 func main() {
-	var debug bool
-
-	flag.BoolVar(&debug, "debug", false, "set to true to run the provider with support for debuggers like delve")
-	flag.Parse()
-
-	opts := &plugin.ServeOpts{
-		Debug:        debug,
-		ProviderFunc: postgresql.Provider,
-		ProviderAddr: "registry.terraform.io/cyrilgdn/postgresql",
-	}
-	plugin.Serve(opts)
+	plugin.Serve(&plugin.ServeOpts{
+		ProviderFunc: postgresql.Provider})
 }

postgresql/resource_postgresql_security_label_test.go

@@ -146,6 +146,9 @@ func testAccCheckPostgresqlSecurityLabelExists(n string) resource.TestCheckFunc
 		}
 
 		provider, ok := rs.Primary.Attributes[securityLabelProviderAttr]
+		if !ok {
+			return fmt.Errorf("No Attribute for security provider is set")
+		}
 
 		client := testAccProvider.Meta().(*Client)
 		txn, err := startTransaction(client, "")