Fix uniform buffer array size

Author: SaschaWillems

examples/graphicspipelinelibrary/graphicspipelinelibrary.cpp

@@ -23,7 +23,7 @@ class VulkanExample: public VulkanExampleBase
 		glm::mat4 modelView;
 		glm::vec4 lightPos = glm::vec4(0.0f, -2.0f, 1.0f, 0.0f);
 	} uniformData;
-	std::vector<vks::Buffer> uniformBuffers;
+	std::array<vks::Buffer, maxConcurrentFrames> uniformBuffers;
 
 	VkPipelineLayout pipelineLayout{ VK_NULL_HANDLE };
 	VkDescriptorSetLayout descriptorSetLayout{ VK_NULL_HANDLE };