Make error enums non_exhaustive

This will allow us to add variants without them being breaking changes, and
I don't think you should be exhaustively matching our errors regardless.

Author: IsaacWoods

src/aml/mod.rs

@@ -2579,10 +2579,8 @@ pub enum Operation {
     ParseResource,
 }
 
-/*
- * TODO: not sure if we should use a better error reporting system or just keep a giant enum?
- */
 #[derive(Clone, PartialEq, Debug)]
+#[non_exhaustive]
 pub enum AmlError {
     RunOutOfStream,
     IllegalOpcode(u16),

src/lib.rs

@@ -235,6 +235,7 @@ pub unsafe trait AcpiTable {
 }
 
 #[derive(Clone, Debug)]
+#[non_exhaustive]
 pub enum AcpiError {
     NoValidRsdp,
     RsdpIncorrectSignature,