Fixes from PR

Signed-off-by: Ayush Singh <[email protected]>

Author: Ayush1325

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

@@ -40,11 +40,10 @@ impl io::Read for Stdin {
             return Err(io::const_io_error!(io::ErrorKind::Interrupted, "Special Key Press"));
         }
 
-        // The option unwrap is safe since iterator will have 1 element.
-        let ch: char = char::decode_utf16([inp])
-            .next()
-            .unwrap()
-            .map_err(|_| io::const_io_error!(io::ErrorKind::InvalidInput, "Invalid Input"))?;
+        let Some(Ok(ch)) = char::decode_utf16([inp]).next() else {
+            return Err(const_io_error!(io::ErrorKind::InvalidInput, "Invalid Input"));
+        };
+
         if ch.len_utf8() > buf.len() {
             self.pending = Some(ch);
             return Ok(0);
@@ -116,6 +115,7 @@ fn write(
     };
 
     let mut utf16: Vec<u16> = utf8.encode_utf16().collect();
+    // NULL terminate the string
     utf16.push(0);
 
     unsafe { simple_text_output(protocol, &mut utf16) }?;