stats: add RSL line number to TCP stats name

Change-Id: Ie42d8a0cb3757f2d01a4b6d69ea2bcce400b7538
diff --git a/src/input/ipaccess.c b/src/input/ipaccess.c
index dbb8b2e..b410a7e 100644
--- a/src/input/ipaccess.c
+++ b/src/input/ipaccess.c
@@ -342,7 +342,9 @@
 				     "could not register FD\n");
 				goto err;
 			}
-			osmo_stats_tcp_osmo_fd_register(newbfd, "ipa-rsl");
+			char stat_name[16];
+			snprintf(stat_name, sizeof(stat_name), "ipa-rsl-%u", unit_data.trx_id);
+			osmo_stats_tcp_osmo_fd_register(newbfd, stat_name);
 
 			e1i_ts = ipaccess_line_ts(newbfd, new_line);
 			ipaccess_bsc_keepalive_fsm_alloc(e1i_ts, newbfd, "rsl_bsc_to_bts");