typo in sgsn_test

(committing just to test gerrit, if it goes through it's still a valid change)

Change-Id: I3291ea2da99cd7f0e2f340b0e6fd6022d088beb8
diff --git a/openbsc/tests/sgsn/sgsn_test.c b/openbsc/tests/sgsn/sgsn_test.c
index 48f013d..f425c33 100644
--- a/openbsc/tests/sgsn/sgsn_test.c
+++ b/openbsc/tests/sgsn/sgsn_test.c
@@ -536,7 +536,7 @@
 		0x10, 0x01, 0x03,
 	};
 
-	printf("Testing subcriber GSUP handling\n");
+	printf("Testing subscriber GSUP handling\n");
 
 	update_subscriber_data_cb = my_dummy_sgsn_update_subscriber_data;