vexos: remove accidental semicolon

Author: tropicaaal

library/std/src/sys/stdio/vexos.rs

@@ -56,8 +56,8 @@ impl io::Write for Stdout {
 
             let count = unsafe {
                 vex_sdk::vexSerialWriteBuffer(STDIO_CHANNEL, chunk.as_ptr(), chunk.len() as u32)
-                    as usize;
-            };
+            } as usize;
+
             if count < 0 {
                 return Err(io::Error::new(
                     io::ErrorKind::Uncategorized,