tty: fix comment typo in synclink_gt.c

Fix typo "looopback" to "loopback" in synclink_gt.c

Signed-off-by: Masanari Iida<standby24x7@gmail.com>
cc:Jiri Koshina<jkosina@suze.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c
index 18b48cd..01a1ff4 100644
--- a/drivers/tty/synclink_gt.c
+++ b/drivers/tty/synclink_gt.c
@@ -3924,7 +3924,7 @@
  */
 static void enable_loopback(struct slgt_info *info)
 {
-	/* SCR (serial control) BIT2=looopback enable */
+	/* SCR (serial control) BIT2=loopback enable */
 	wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
 
 	if (info->params.mode != MGSL_MODE_ASYNC) {