Fix assertion

When we copy onto ovector[MAX_OV_USED] == ovector[MAX_MATCHES * 2], we
want to make sure that we do not exceed the destination, not the source.

src/vmod_re.c

@@ -187,7 +187,7 @@ match(VRT_CTX, vre_t *vre, VCL_STRING subject, struct vmod_priv *task,
 
 	memset(ov->ovector, -1, sizeof(ov->ovector));
 	cp = s * 2 * sizeof(*nov);
-	assert(cp <= sizeof(nov));
+	assert(cp <= sizeof(ov->ovector));
 	memcpy(ov->ovector, nov, cp);
 	return 1;
 }