Use the nullsafe operator in SessionGuard (#41561)

Author: hAz5

src/Illuminate/Auth/SessionGuard.php

@@ -685,9 +685,7 @@ protected function rehashUserPassword($password, $attribute)
      */
     public function attempting($callback)
     {
-        if (isset($this->events)) {
-            $this->events->listen(Events\Attempting::class, $callback);
-        }
+        $this->events?->listen(Events\Attempting::class, $callback);
     }
 
     /**
@@ -699,11 +697,7 @@ public function attempting($callback)
      */
     protected function fireAttemptEvent(array $credentials, $remember = false)
     {
-        if (isset($this->events)) {
-            $this->events->dispatch(new Attempting(
-                $this->name, $credentials, $remember
-            ));
-        }
+        $this->events?->dispatch(new Attempting($this->name, $credentials, $remember));
     }
 
     /**
@@ -714,11 +708,7 @@ protected function fireAttemptEvent(array $credentials, $remember = false)
      */
     protected function fireValidatedEvent($user)
     {
-        if (isset($this->events)) {
-            $this->events->dispatch(new Validated(
-                $this->name, $user
-            ));
-        }
+        $this->events?->dispatch(new Validated($this->name, $user));
     }
 
     /**
@@ -730,11 +720,7 @@ protected function fireValidatedEvent($user)
      */
     protected function fireLoginEvent($user, $remember = false)
     {
-        if (isset($this->events)) {
-            $this->events->dispatch(new Login(
-                $this->name, $user, $remember
-            ));
-        }
+        $this->events?->dispatch(new Login($this->name, $user, $remember));
     }
 
     /**
@@ -745,11 +731,7 @@ protected function fireLoginEvent($user, $remember = false)
      */
     protected function fireAuthenticatedEvent($user)
     {
-        if (isset($this->events)) {
-            $this->events->dispatch(new Authenticated(
-                $this->name, $user
-            ));
-        }
+        $this->events?->dispatch(new Authenticated($this->name, $user));
     }
 
     /**
@@ -760,11 +742,7 @@ protected function fireAuthenticatedEvent($user)
      */
     protected function fireOtherDeviceLogoutEvent($user)
     {
-        if (isset($this->events)) {
-            $this->events->dispatch(new OtherDeviceLogout(
-                $this->name, $user
-            ));
-        }
+        $this->events?->dispatch(new OtherDeviceLogout($this->name, $user));
     }
 
     /**
@@ -776,11 +754,7 @@ protected function fireOtherDeviceLogoutEvent($user)
      */
     protected function fireFailedEvent($user, array $credentials)
     {
-        if (isset($this->events)) {
-            $this->events->dispatch(new Failed(
-                $this->name, $user, $credentials
-            ));
-        }
+        $this->events?->dispatch(new Failed($this->name, $user, $credentials));
     }
 
     /**