libmsc/gsm_04_08: make use of msc_a in gsm48_rx_rr_app_info()

Change-Id: I2a0991c9bbf86b7eb248d74334f9472c56a3c964
diff --git a/src/libmsc/gsm_04_08.c b/src/libmsc/gsm_04_08.c
index b284ccd..df48bcb 100644
--- a/src/libmsc/gsm_04_08.c
+++ b/src/libmsc/gsm_04_08.c
@@ -1237,8 +1237,9 @@
 	apdu_len = gh->data[1];
 	apdu_data = gh->data+2;
 
-	DEBUGP(DRR, "RX APPLICATION INFO id/flags=0x%02x apdu_len=%u apdu=%s\n",
-		apdu_id_flags, apdu_len, osmo_hexdump(apdu_data, apdu_len));
+	LOG_MSC_A_CAT(msc_a, DRR, LOGL_DEBUG, "Rx RR APPLICATION INFO "
+		      "(id/flags=0x%02x apdu_len=%u apdu=%s)\n",
+		      apdu_id_flags, apdu_len, osmo_hexdump(apdu_data, apdu_len));
 
 	/* we're not using the app info blob anywhere, so ignore. */
 #if 0