Fix typo in DmaBuf tests

Caused roll failure starting here:
https://chromium-review.googlesource.com/c/chromium/src/+/3314932/

Bug: None
Change-Id: I8f348a4fea243364fefc01f902add33abff66d1d
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/71700
Auto-Submit: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>

src/tests/white_box/VulkanImageWrappingTestsDmaBuf.cpp

diff --git a/src/tests/white_box/VulkanImageWrappingTestsDmaBuf.cpp b/src/tests/white_box/VulkanImageWrappingTestsDmaBuf.cpp
index 3b4fc07..f1f3c27 100644
--- a/src/tests/white_box/VulkanImageWrappingTestsDmaBuf.cpp
+++ b/src/tests/white_box/VulkanImageWrappingTestsDmaBuf.cpp
@@ -316,7 +316,7 @@
             deviceDescriptor.forceDisabledToggles = GetParam().forceDisabledWorkarounds;
 
             secondDeviceVk =
-                dawn_native::vullkan::ToBackend(backendAdapter->CreateDevice(&deviceDescriptor));
+                dawn_native::vulkan::ToBackend(backendAdapter->CreateDevice(&deviceDescriptor));
             secondDevice = wgpu::Device::Acquire(dawn_native::ToAPI(secondDeviceVk));
         }