Fix Vulkan error check

(cherry picked from commit a551c2a6d7f67a290d39b1597d3edd9eb6182457)

src/gpu/vulkan/SDL_gpu_vulkan.c

@@ -4789,7 +4789,7 @@ static Uint32 VULKAN_INTERNAL_CreateSwapchain(
             CHECK_VULKAN_ERROR_AND_RETURN(vulkanResult, vkCreateSemaphore, false);
         }
 
-        renderer->vkCreateSemaphore(
+        vulkanResult = renderer->vkCreateSemaphore(
             renderer->logicalDevice,
             &semaphoreCreateInfo,
             NULL,