gsm48_generate_mid(): mask out ODD flag from mi_type

For MI encoding, see 3GPP TS 24.008, 10.5.1.4 Mobile Identity. The 'odd' flag
indicates whether the last BCD nibble is used. Of course that flag should be
made sure to reflect the actual length.

Change-Id: Id6e695ebf9f86b295eaa7e2c6228989256f37e68
diff --git a/tests/gsm0408/gsm0408_test.c b/tests/gsm0408/gsm0408_test.c
index c786d38..9bb320d 100644
--- a/tests/gsm0408/gsm0408_test.c
+++ b/tests/gsm0408/gsm0408_test.c
@@ -380,7 +380,7 @@
 	{
 		.mi_type = GSM_MI_TYPE_IMSI | GSM_MI_ODD,
 		.mi_str = "423423",
-		.expect_mi_tlv_hex = "1704493224f3", /* encodes "odd" for even number of digits! */
+		.expect_mi_tlv_hex = "1704413224f3",
 	},
 	{
 		.mi_type = GSM_MI_TYPE_IMSI,
@@ -464,7 +464,7 @@
 	{
 		.mi_type = GSM_MI_ODD,
 		.mi_str = "1234",
-		.expect_mi_tlv_hex = "17031832f4", /* encoding invalid MI type, and "odd" for an even number of digits */
+		.expect_mi_tlv_hex = "17031032f4", /* encoding invalid MI type */
 		.expect_str = "",
 	},
 };