chore: update VK.java

Author: squid233

modules/overrungl.vulkan/src/main/java/overrungl/vulkan/VK.java

@@ -20,6 +20,7 @@
 import overrungl.util.MemoryUtil;
 
 import java.lang.foreign.MemorySegment;
+import java.util.Objects;
 
 /**
  * This class loads the Vulkan library into the JVM process.
@@ -108,9 +109,6 @@ private MemorySegment getFunctionAddress(String name, boolean required) {
 
     /// {@return instance of [GlobalCommands]}
     public static GlobalCommands globalCommands() {
-        if (globalCommands == null) {
-            throw new NullPointerException("globalCommands is null; call VK::create first");
-        }
-        return globalCommands;
+        return Objects.requireNonNull(globalCommands, "Global commands are not loaded; call VK::create first");
     }
 }