partitioning/writer: Always sync before close

Otherwise, the buffers don't flush and nothing works without
divine intervention.

Signed-off-by: Ikey Doherty <[email protected]>

Author: ikeycode

crates/partitioning/src/writer.rs

@@ -159,8 +159,10 @@ impl<'a> DiskWriter<'a> {
             );
         }
 
+        // Consume and sync the GPT table
         if writable {
-            gpt_table.write_inplace()?;
+            let original = gpt_table.write()?;
+            original.sync_all()?;
         }
 
         Ok(())