gtphub: fix fatal log msg for SGSN proxy.

While reworking the logging, a stray comma found its way into the code.

Fixes coverity 1339765.

Sponsored-by: On-Waves ehi
diff --git a/openbsc/src/gprs/gtphub.c b/openbsc/src/gprs/gtphub.c
index 049e9f5..406d60d 100644
--- a/openbsc/src/gprs/gtphub.c
+++ b/openbsc/src/gprs/gtphub.c
@@ -1878,7 +1878,7 @@
 				      &hub->to_sgsns[plane_idx],
 				      &cfg->sgsn_proxy[plane_idx])
 		    != 0) {
-			LOG(LOGL_FATAL, "Cannot configure SGSN proxy",
+			LOG(LOGL_FATAL, "Cannot configure SGSN proxy"
 			    " %s port %d.\n",
 			    cfg->sgsn_proxy[plane_idx].addr_str,
 			    (int)cfg->sgsn_proxy[plane_idx].port);