initialize IAM store before Init() to avoid any crash (#11236)

cmd/iam.go

@@ -444,6 +444,9 @@ func (sys *IAMSys) Initialized() bool {
 
 // Init - initializes config system by reading entries from config/iam
 func (sys *IAMSys) Init(ctx context.Context, objAPI ObjectLayer) {
+	// Initialize IAM store
+	sys.InitStore(objAPI)
+
 	retryCtx, cancel := context.WithCancel(ctx)
 
 	// Indicate to our routine to exit cleanly upon return.

cmd/server-main.go

@@ -356,9 +356,6 @@ func initAllSubsystems(ctx context.Context, newObject ObjectLayer) (err error) {
 		logger.LogIf(ctx, fmt.Errorf("Unable to initialize config, some features may be missing %w", err))
 	}
 
-	// Initialize IAM store
-	globalIAMSys.InitStore(newObject)
-
 	// Populate existing buckets to the etcd backend
 	if globalDNSConfig != nil {
 		// Background this operation.