gsm: gsm_utils: Fix return type of API ms_class_gmsk_dbm() and add unit tests
Only known user of API is in osmocom-bb and it compiles fine after the
change.
Related: OS#4244
Change-Id: Ia10345008b3aca50b30482ef3b852b03eca71995
diff --git a/include/osmocom/gsm/gsm_utils.h b/include/osmocom/gsm/gsm_utils.h
index 38a3f6e..de63434 100644
--- a/include/osmocom/gsm/gsm_utils.h
+++ b/include/osmocom/gsm/gsm_utils.h
@@ -115,8 +115,7 @@
uint8_t gsm_get_octet_len(const uint8_t sept_len);
int gsm_7bit_decode_n_hdr(char *decoded, size_t n, const uint8_t *user_data, uint8_t length, uint8_t ud_hdr_ind);
-unsigned int ms_class_gmsk_dbm(enum gsm_band band, int ms_class);
-
+int ms_class_gmsk_dbm(enum gsm_band band, int ms_class);
int ms_pwr_ctl_lvl(enum gsm_band band, unsigned int dbm);
int ms_pwr_dbm(enum gsm_band band, uint8_t lvl);