clippy: Switch to tool attributes for suppressing lints

Tool attributes were stabilized in Rust 1.31:
https://blog.rust-lang.org/2018/12/06/Rust-1.31-and-rust-2018.html#tool-lints

Before:

    #[cfg_attr(feature = "cargo-clippy", allow(cast_ptr_alignment)]

After:

    #[allow(clippy::cast_ptr_alignment)]

TEST=cargo check --all-features

Change-Id: If2f1511f6231d60578b5e0d5bd4210a68eb08caf
Reviewed-on: https://chromium-review.googlesource.com/1566651
Commit-Ready: David Tolnay <dtolnay@chromium.org>
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: David Tolnay <dtolnay@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: David Tolnay <dtolnay@chromium.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/kvm/src/lib.rs b/kvm/src/lib.rs
index 919aad3..16d73f1 100644
--- a/kvm/src/lib.rs
+++ b/kvm/src/lib.rs
@@ -1162,7 +1162,7 @@ impl Vcpu {
     ///
     /// This function should be called after `Vcpu::run` returns an `VcpuExit::IoIn` or
     /// `Vcpu::MmioRead`.
-    #[cfg_attr(feature = "cargo-clippy", allow(cast_ptr_alignment))]
+    #[allow(clippy::cast_ptr_alignment)]
     pub fn set_data(&self, data: &[u8]) -> Result<()> {
         // Safe because we know we mapped enough memory to hold the kvm_run struct because the
         // kernel told us how large it was. The pointer is page aligned so casting to a different
@@ -1211,7 +1211,7 @@ impl Vcpu {
     ///
     /// Note that the state of the VCPU and associated VM must be setup first for this to do
     /// anything useful.
-    #[cfg_attr(feature = "cargo-clippy", allow(cast_ptr_alignment))]
+    #[allow(clippy::cast_ptr_alignment)]
     // The pointer is page aligned so casting to a different type is well defined, hence the clippy
     // allow attribute.
     pub fn run(&self) -> Result<VcpuExit> {