fix errmsg in f_ctrl_set() which said "GET"

Change-Id: I56cd20c3c1b22ac0b1e5c03727c4e6d6cbfa6973
diff --git a/library/Osmocom_CTRL_Functions.ttcn b/library/Osmocom_CTRL_Functions.ttcn
index 15cb26f..8d5607b 100644
--- a/library/Osmocom_CTRL_Functions.ttcn
+++ b/library/Osmocom_CTRL_Functions.ttcn
@@ -61,7 +61,7 @@
 		[] pt.receive(tr_CtrlMsgSetRepl(id, variable, val)) { }
 		[] pt.receive(tr_CtrlMsgTrap) { repeat; }
 		[] pt.receive(tr_CtrlMsgError) -> value rx {
-			setverdict(fail, "Error in CTRL GET ", variable, ": ", rx.err.reason);
+			setverdict(fail, "Error in CTRL SET ", variable, ": ", rx.err.reason);
 			mtc.stop;
 			}
 		[] T.timeout {