Fix some typos

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

Change-Id: Ie66b89065f2100c1d2125ce5a6c9b1d58df7c8ad
diff --git a/src/libmsc/gsm_09_11.c b/src/libmsc/gsm_09_11.c
index 8a13cda..b696a67 100644
--- a/src/libmsc/gsm_09_11.c
+++ b/src/libmsc/gsm_09_11.c
@@ -265,7 +265,7 @@
 
 	if (trans->msc_a) {
 		LOG_MSC_A_CAT(msc_a, DPAG, LOGL_ERROR,
-			      "Handle paging error: transaction already associated with subsciber,"
+			      "Handle paging error: transaction already associated with subscriber,"
 			      " apparently it was already handled. Skip.\n");
 		return;
 	}