device_path: add .data() accessor

Author: phip1611

uefi/src/proto/device_path/mod.rs

@@ -176,6 +176,12 @@ impl DevicePathNode {
         self.full_type() == (DeviceType::END, DeviceSubType::END_ENTIRE)
     }
 
+    /// True if this node ends an entire [`DevicePath`].
+    #[must_use]
+    pub fn data(&self) -> &[u8] {
+        &self.data
+    }
+
     /// Convert from a generic [`DevicePathNode`] reference to an enum
     /// of more specific node types.
     pub fn as_enum(&self) -> Result<DevicePathNodeEnum, NodeConversionError> {