sulogin: ensure Ctrl-D returns OK(0) also for pwd login prompt

sulogin should return OK (exit code 0) when the user presses Ctrl-D,
regardless of the prompt shown.  Otherwise Finit may look for another
sulogin to run straight after this one.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/sulogin.c

@@ -177,8 +177,10 @@ int main(void)
 			ch = getchar();
 			if (ch == '\n' || ch == '\r')
 				break;
-			if (ch == 4 || ch == EOF) /* Ctrl-D */
+			if (ch == 4 || ch == EOF) { /* Ctrl-D */
+				rc = 0;
 				goto exit;
+			}
 
 			pwd[i++] = ch;
 		} while (i + 1 < sizeof(pwd));