comp: Fix vk_deinit_mutex asserts when vk_create_device fails.
When vk_create_device fails, compositor_init_vulkan returns false. Upon entering destroy, executing vk_deinit_mutex causes an assertion because the mutex was not initialized.
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When vk_create_device fails, compositor_init_vulkan returns false. Upon entering destroy, executing vk_deinit_mutex causes an assertion because the mutex was not initialized.