fixed spelling of 'preferred'

Bug: skia:
Change-Id: I46f456925fa7bb10b87585f7e17f114c2db04d9b
Reviewed-on: https://skia-review.googlesource.com/156006
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/src/gpu/vk/GrVkGpu.cpp b/src/gpu/vk/GrVkGpu.cpp
index d68220b..8c63ea8 100644
--- a/src/gpu/vk/GrVkGpu.cpp
+++ b/src/gpu/vk/GrVkGpu.cpp
@@ -1030,7 +1030,7 @@
 
     int samples = rt->numStencilSamples();
 
-    const GrVkCaps::StencilFormat& sFmt = this->vkCaps().preferedStencilFormat();
+    const GrVkCaps::StencilFormat& sFmt = this->vkCaps().preferredStencilFormat();
 
     GrVkStencilAttachment* stencil(GrVkStencilAttachment::Create(this,
                                                                  width,