Input: libps2.c: fix comment typo arrrives.

Fix a typo in a comment.

Signed-off-by: Justin P. Mattock <justinmattock@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/input/serio/libps2.c b/drivers/input/serio/libps2.c
index 980af94..07a8363 100644
--- a/drivers/input/serio/libps2.c
+++ b/drivers/input/serio/libps2.c
@@ -210,7 +210,7 @@
 	/*
 	 * Some devices (Synaptics) peform the reset before
 	 * ACKing the reset command, and so it can take a long
-	 * time before the ACK arrrives.
+	 * time before the ACK arrives.
 	 */
 	if (ps2_sendbyte(ps2dev, command & 0xff,
 			 command == PS2_CMD_RESET_BAT ? 1000 : 200))