s/retreiv/retriev/g

As everyone knows, the rule is: "i before e.. um.. always."

Signed-off-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/drivers/char/n_hdlc.c b/drivers/char/n_hdlc.c
index c3660d8..a133a62 100644
--- a/drivers/char/n_hdlc.c
+++ b/drivers/char/n_hdlc.c
@@ -562,7 +562,7 @@
 }	/* end of n_hdlc_tty_receive() */
 
 /**
- * n_hdlc_tty_read - Called to retreive one frame of data (if available)
+ * n_hdlc_tty_read - Called to retrieve one frame of data (if available)
  * @tty - pointer to tty instance data
  * @file - pointer to open file object
  * @buf - pointer to returned data buffer