Fix some typos

Fix typos and common misspellings in code comments and log messages.

Change-Id: Ie66b89065f2100c1d2125ce5a6c9b1d58df7c8ad
diff --git a/src/libmsc/sms_queue.c b/src/libmsc/sms_queue.c
index d60cb4a..c00a8c6 100644
--- a/src/libmsc/sms_queue.c
+++ b/src/libmsc/sms_queue.c
@@ -1,4 +1,4 @@
-/* SMS queue to continously attempt to deliver SMS */
+/* SMS queue to continuously attempt to deliver SMS */
 /*
  * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
  * All Rights Reserved