Updated to work with recent nightly

Author: TheDan64

hello-world/src/lib.rs

@@ -3,7 +3,7 @@
 
 extern crate alloc;
 use alloc::borrow::ToOwned;
-use alloc::String;
+use alloc::string::String;
 
 #[macro_use]
 extern crate linux_kernel_module;

src/allocator.rs

@@ -22,6 +22,6 @@ unsafe impl GlobalAlloc for KernelAllocator {
 }
 
 #[alloc_error_handler]
-extern "C" fn oom(_layout: Layout) -> ! {
+fn oom(_layout: Layout) -> ! {
     panic!("Out of memory!");
 }