Add explicit `dyn` for trait objects

Fix "trait objects without an explicit `dyn` are deprecated" warnings
introduced in Rust 1.38.

BUG=None
TEST=emerge-nami crosvm

Change-Id: I8ca6aa747475268ae898adddd5d091d401326ceb
Signed-off-by: Daniel Verkamp <dverkamp@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1862999
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Reviewed-by: Stephen Barber <smbarber@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/resources/src/gpu_allocator.rs b/resources/src/gpu_allocator.rs
index a44d3c8..478d0d4 100644
--- a/resources/src/gpu_allocator.rs
+++ b/resources/src/gpu_allocator.rs
@@ -111,7 +111,8 @@ impl GpuMemoryAllocator for GpuBufferDevice {
 }
 
 #[cfg(feature = "wl-dmabuf")]
-pub fn create_gpu_memory_allocator() -> Result<Option<Box<GpuMemoryAllocator>>, GpuAllocatorError> {
+pub fn create_gpu_memory_allocator(
+) -> Result<Option<Box<dyn GpuMemoryAllocator>>, GpuAllocatorError> {
     let undesired: &[&str] = &["vgem", "pvr"];
     let fd = gpu_buffer::rendernode::open_device(undesired)
         .map_err(|_| GpuAllocatorError::OpenGpuBufferDevice)?;