chore: improve init/deinit methods

src/core/bus/Bios.zig

@@ -27,8 +27,9 @@ pub fn init(alloc: Allocator, maybe_path: ?[]const u8) !Self {
     };
 }
 
-pub fn deinit(self: Self) void {
+pub fn deinit(self: *Self) void {
     if (self.buf) |buf| self.alloc.free(buf);
+    self.* = undefined;
 }
 
 pub fn read(self: *Self, comptime T: type, r15: u32, addr: u32) T {

src/core/bus/Ewram.zig

@@ -17,8 +17,9 @@ pub fn init(alloc: Allocator) !Self {
     };
 }
 
-pub fn deinit(self: Self) void {
+pub fn deinit(self: *Self) void {
     self.alloc.free(self.buf);
+    self.* = undefined;
 }
 
 pub fn read(self: *const Self, comptime T: type, address: usize) T {

src/core/bus/GamePak.zig

@@ -58,9 +58,10 @@ inline fn isLarge(self: *const Self) bool {
     return self.buf.len > 0x100_0000;
 }
 
-pub fn deinit(self: Self) void {
-    self.alloc.free(self.buf);
+pub fn deinit(self: *Self) void {
     self.backup.deinit();
+    self.alloc.free(self.buf);
+    self.* = undefined;
 }
 
 pub fn read(self: *Self, comptime T: type, address: u32) T {

src/core/bus/Iwram.zig

@@ -17,8 +17,9 @@ pub fn init(alloc: Allocator) !Self {
     };
 }
 
-pub fn deinit(self: Self) void {
+pub fn deinit(self: *Self) void {
     self.alloc.free(self.buf);
+    self.* = undefined;
 }
 
 pub fn read(self: *const Self, comptime T: type, address: usize) T {

src/core/bus/backup.zig

@@ -74,9 +74,10 @@ pub const Backup = struct {
         return null;
     }
 
-    pub fn deinit(self: Self) void {
+    pub fn deinit(self: *Self) void {
         if (self.save_path) |path| self.writeSaveToDisk(self.alloc, path) catch |e| log.err("Failed to write save: {}", .{e});
         self.alloc.free(self.buf);
+        self.* = undefined;
     }
 
     fn loadSaveFromDisk(self: *Self, allocator: Allocator, path: []const u8) !void {