ussd: Move to use gsm_7bit_encode_n_ussd for USSD encoding
The legacy functions have a bad/wrong return value for the number
of septets in the string. Change the code to use the new functions
which will fix encoding issues as well.
diff --git a/openbsc/src/libmsc/gsm_04_80.c b/openbsc/src/libmsc/gsm_04_80.c
index 39738a5..b30f9ee 100644
--- a/openbsc/src/libmsc/gsm_04_80.c
+++ b/openbsc/src/libmsc/gsm_04_80.c
@@ -72,7 +72,7 @@
/* First put the payload text into the message */
ptr8 = msgb_put(msg, 0);
- response_len = gsm_7bit_encode(ptr8, response_text);
+ gsm_7bit_encode_n_ussd(ptr8, msgb_tailroom(msg), response_text, &response_len);
msgb_put(msg, response_len);
/* Then wrap it as an Octet String */