abis: Use the right return value for abis_nm_pchan4chcomb
abis_nm_pchan4chcomb will return a pchan for a given channel
combination but returned a value of the channel combination.
Fix it to return the physical channel combination.
Fixes: Coverity CID 1040767
diff --git a/include/osmocom/gsm/abis_nm.h b/include/osmocom/gsm/abis_nm.h
index 4dee012..4682ead 100644
--- a/include/osmocom/gsm/abis_nm.h
+++ b/include/osmocom/gsm/abis_nm.h
@@ -43,7 +43,7 @@
int abis_nm_chcomb4pchan(enum gsm_phys_chan_config pchan);
-enum abis_nm_chan_comb abis_nm_pchan4chcomb(uint8_t chcomb);
+enum gsm_phys_chan_config abis_nm_pchan4chcomb(uint8_t chcomb);
/*! @} */