Fix build failure in ramdisk test calls

Author: jasoncouture

tests/ramdisk.rs

@@ -7,14 +7,14 @@ static RAMDISK_PATH: &str = "tests/ramdisk.txt";
 fn basic_boot() {
     run_test_kernel_with_ramdisk(
         env!("CARGO_BIN_FILE_TEST_KERNEL_RAMDISK_basic_boot"),
-        Some(Path::new(RAMDISK_PATH)),
+        Some(Path::new(RAMDISK_PATH).to_path_buf()),
     );
 }
 
 #[test]
 fn check_ramdisk() {
     run_test_kernel_with_ramdisk(
         env!("CARGO_BIN_FILE_TEST_KERNEL_RAMDISK_ramdisk"),
-        Some(Path::new(RAMDISK_PATH)),
+        Some(Path::new(RAMDISK_PATH).to_path_buf()),
     );
 }