tests/sockaddr_str: rc_name(): also handle -EAFNOSUPPORT

Change-Id: I489378705e19c6b09f2fa894ddea4b8a0dc0c7e4
diff --git a/tests/sockaddr_str/sockaddr_str_test.c b/tests/sockaddr_str/sockaddr_str_test.c
index 676068c..4e8500b 100644
--- a/tests/sockaddr_str/sockaddr_str_test.c
+++ b/tests/sockaddr_str/sockaddr_str_test.c
@@ -73,6 +73,8 @@
 	switch (rc) {
 	case -EINVAL:
 		return "rc == -EINVAL";
+	case -EAFNOSUPPORT:
+		return "rc == -EAFNOSUPPORT";
 	case 0:
 		return "rc == 0";
 	default: