pam: Insert newline when read fails

Fixes #1171

Signed-off-by: Wesley Hershberger <[email protected]>

Author: MggMuggins

src/pam/rpassword.rs

@@ -271,15 +271,20 @@ impl Terminal<'_> {
     pub fn read_password(&mut self, timeout: Option<Duration>) -> io::Result<PamBuffer> {
         let mut input = self.source_timeout(timeout);
         let _hide_input = HiddenInput::new(false)?;
-        read_unbuffered(&mut input)
+        let ret = read_unbuffered(&mut input);
+        if ret.is_err() {
+            let _ = self.sink().write(b"\n");
+        }
+
+        ret
     }
 
     /// Reads input with TTY echo disabled, but do provide visual feedback while typing.
     pub fn read_password_with_feedback(
         &mut self,
         timeout: Option<Duration>,
     ) -> io::Result<PamBuffer> {
-        if let Some(hide_input) = HiddenInput::new(true)? {
+        let ret = if let Some(hide_input) = HiddenInput::new(true)? {
             match self {
                 Terminal::StdIE(stdin, stdout) => {
                     let mut reader = TimeoutRead::new(stdin.as_fd(), timeout);
@@ -292,7 +297,13 @@ impl Terminal<'_> {
             }
         } else {
             read_unbuffered(&mut self.source_timeout(timeout))
+        };
+
+        if ret.is_err() {
+            let _ = self.sink().write(b"\n");
         }
+
+        ret
     }
 
     /// Reads input with TTY echo enabled