GMM: Don't use DGPRS logging category from GMM
diff --git a/openbsc/src/gprs/gprs_gmm.c b/openbsc/src/gprs/gprs_gmm.c
index 3fb12c5..89e207a 100644
--- a/openbsc/src/gprs/gprs_gmm.c
+++ b/openbsc/src/gprs/gprs_gmm.c
@@ -1664,7 +1664,7 @@
 			rc = sgsn_ares_query(sgsn, hostname,
 					ggsn_lookup_cb, lookup);
 			if (rc != 0) {
-				LOGP(DGPRS, LOGL_ERROR, "Couldn't start GGSN\n");
+				LOGMMCTXP(LOGL_ERROR, mmctx, "Couldn't start GGSN\n");
 				goto reject_due_failure;
 			}
 			return;
@@ -1866,7 +1866,7 @@
 	return 0;
 
 no_context:
-	LOGP(DGPRS, LOGL_ERROR, "No GGSN context found!\n");
+	LOGMMCTXP(LOGL_ERROR, mmctx, "No GGSN context found!\n");
 	return gsm48_tx_gsm_act_pdp_rej(mmctx, transaction_id,
 					gsm_cause, 0, NULL);
 }