Use PathBuf instead of Path to avoid borrow error

Author: phil-opp

docs/create-disk-image.md

@@ -38,14 +38,14 @@ members = ["kernel"]
 ```rust
 // build.rs
 
-use std::path::Path;
+use std::path::PathBuf;
 
 fn main() {
     // set by cargo, build scripts should use this directory for output files
-    let out_dir = Path::new(&std::env::var_os("OUT_DIR").unwrap());
+    let out_dir = PathBuf::from(std::env::var_os("OUT_DIR").unwrap());
     // set by cargo's artifact dependency feature, see
     // https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#artifact-dependencies
-    let kernel = Path::new(&std::env::var_os("CARGO_BIN_FILE_KERNEL_kernel").unwrap());
+    let kernel = PathBuf::from(std::env::var_os("CARGO_BIN_FILE_KERNEL_kernel").unwrap());
 
     // create an UEFI disk image (optional)
     let uefi_path = out_dir.join("uefi.img");