fix: account for null edid pointer

Co-authored-by: Lysander Mealy <[email protected]>

src/framebuffer.rs

@@ -1,6 +1,6 @@
 //! Auxiliary types for the [framebuffer request](crate::request::FramebufferRequest)
 
-use core::ffi::c_void;
+use core::{ffi::c_void, ptr::NonNull};
 
 #[derive(Clone, Copy)]
 #[repr(C)]
@@ -19,7 +19,7 @@ pub(crate) struct RawFramebufferV0 {
     blue_mask_shift: u8,
     _unused: [u8; 7],
     edid_size: u64,
-    edid: *mut u8,
+    edid: Option<NonNull<u8>>,
 }
 
 #[derive(Clone, Copy)]
@@ -164,8 +164,12 @@ impl<'a> Framebuffer<'a> {
     }
 
     /// The raw EDID bytes of the display attached to this framebuffer.
-    pub fn edid(&self) -> &[u8] {
-        unsafe { core::slice::from_raw_parts(self.inner.v0.edid, self.inner.v0.edid_size as usize) }
+    pub fn edid(&self) -> Option<&[u8]> {
+        unsafe {
+            self.inner.v0.edid.map(|ptr| {
+                core::slice::from_raw_parts(ptr.as_ptr(), self.inner.v0.edid_size as usize)
+            })
+        }
     }
 
     /// The video modes supported on this framebuffer. Only available on