BSC_Tests: f_assignment_codec(): log the actual value on mismatch

Change-Id: I437c1e796b00bfae41620f05ef8f15c8db8ca3d9
diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index cd9514e..4d7717e 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -4354,8 +4354,8 @@
 			log("found RSL MR CONFIG IE: ", mr_conf);
 
 			if (not match(mr_conf, g_pars.expect_mr_conf_ie)) {
-				setverdict(fail, "RSL MR CONFIG IE does not match expectation. Expected: ",
-					g_pars.expect_mr_conf_ie);
+				setverdict(fail, "RSL MR CONFIG IE does not match expectation. ",
+					   "Expected: ", g_pars.expect_mr_conf_ie, ", got: ", mr_conf);
 			}
 		} else {
 			if (f_rsl_find_ie(rsl, RSL_IE_MR_CONFIG, mr_conf) == true) {