gprs_rlcmac_sched: fix mistype of CONTROL ACK

Change-Id: If37b33f69cd659d913ed81eb6060a42734ba524f
Reviewed-on: https://gerrit.osmocom.org/100
Tested-by: Jenkins Builder
Reviewed-by: Holger Freyther <holger@freyther.de>
diff --git a/src/gprs_rlcmac_sched.cpp b/src/gprs_rlcmac_sched.cpp
index 087c03c..cd5f683 100644
--- a/src/gprs_rlcmac_sched.cpp
+++ b/src/gprs_rlcmac_sched.cpp
@@ -132,7 +132,7 @@
 
 		/*
 		 * Assignments for the same direction have lower precedence,
-		 * because they may kill the TBF when the CONTOL ACK is
+		 * because they may kill the TBF when the CONTROL ACK is
 		 * received, thus preventing the others from being processed.
 		 */