extern crate alloc was added accidentally breaking downstream no_std

Author: korken89

src/phy/fuzz_injector.rs

@@ -1,8 +1,6 @@
-extern crate alloc;
-use alloc::vec::Vec;
-
 use crate::phy::{self, Device, DeviceCapabilities};
 use crate::time::Instant;
+use alloc::vec::Vec;
 
 // This could be fixed once associated consts are stable.
 const MTU: usize = 1536;

src/phy/mod.rs

@@ -97,6 +97,7 @@ use crate::time::Instant;
 mod sys;
 
 mod fault_injector;
+#[cfg(feature = "alloc")]
 mod fuzz_injector;
 #[cfg(feature = "alloc")]
 mod loopback;