gtphub: remove obsolete todo comment

Sponsored-by: On-Waves ehi
diff --git a/openbsc/src/gprs/gtphub.c b/openbsc/src/gprs/gtphub.c
index a659e30..465520e 100644
--- a/openbsc/src/gprs/gtphub.c
+++ b/openbsc/src/gprs/gtphub.c
@@ -2193,8 +2193,6 @@
 		}
 	}
 
-	/* TODO set hub->restart_counter from external file. */
-
 	int side_idx;
 	int plane_idx;
 	for_each_side_and_plane(side_idx, plane_idx) {