Char: synclink, remove unnecessary checks

Stanse found a potential null dereference in mgsl_put_char and
mgsl_write. There is a check for tty being NULL, but it is
dereferenced earlier.

Actually, tty cannot be NULL in .write and .put_char, so remove
the tests.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/char/synclink.c

@@ -2031,7 +2031,7 @@ static int mgsl_put_char(struct tty_struct *tty, unsigned char ch)
 	if (mgsl_paranoia_check(info, tty->name, "mgsl_put_char"))
 		return 0;
 
-	if (!tty || !info->xmit_buf)
+	if (!info->xmit_buf)
 		return 0;
 
 	spin_lock_irqsave(&info->irq_spinlock, flags);
@@ -2121,7 +2121,7 @@ static int mgsl_write(struct tty_struct * tty,
 	if (mgsl_paranoia_check(info, tty->name, "mgsl_write"))
 		goto cleanup;
 
-	if (!tty || !info->xmit_buf)
+	if (!info->xmit_buf)
 		goto cleanup;
 
 	if ( info->params.mode == MGSL_MODE_HDLC ||