err log: fix reverse statement in msc_a call handling

Change-Id: I937abe25ba87d0fcddc3351ac391cf6e7e776de6
diff --git a/src/libmsc/msc_a.c b/src/libmsc/msc_a.c
index 5761ed7..f00fb11 100644
--- a/src/libmsc/msc_a.c
+++ b/src/libmsc/msc_a.c
@@ -1319,7 +1319,7 @@
 		return;
 	}
 	if (!cc_trans) {
-		LOG_MSC_A(msc_a, LOGL_ERROR, "Rx Assignment Complete, but CC transaction is active\n");
+		LOG_MSC_A(msc_a, LOGL_ERROR, "Rx Assignment Complete, but no CC transaction is active\n");
 		return;
 	}