connection-test: fix assert

Signed-off-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
diff --git a/tests/connection-test.c b/tests/connection-test.c
index 8be6c38..157e1bc 100644
--- a/tests/connection-test.c
+++ b/tests/connection-test.c
@@ -603,8 +603,8 @@
 	int *done = data;
 
 	assert(strcmp(s, "foo") == 0);
-	assert(u1 = 500);
-	assert(u2 = 404040);
+	assert(u1 == 500);
+	assert(u2 == 404040);
 	*done = 1;
 }