gtphub: fix missing newline in log output

Sponsored-by: On-Waves ehi
diff --git a/openbsc/src/gprs/gtphub.c b/openbsc/src/gprs/gtphub.c
index b123b11..8c0734c 100644
--- a/openbsc/src/gprs/gtphub.c
+++ b/openbsc/src/gprs/gtphub.c
@@ -2487,7 +2487,7 @@
 	}
 
 	if (hub->sgsn_use_sender)
-		LOG(LOGL_NOTICE, "Using sender address and port for SGSN instead of GSN Addr IE and default ports.");
+		LOG(LOGL_NOTICE, "Using sender address and port for SGSN instead of GSN Addr IE and default ports.\n");
 
 	gtphub_gc_start(hub);
 	return 0;