btl/vader: workaround to make jenkins happy

opal/mca/btl/vader/btl_vader_module.c

@@ -609,7 +609,7 @@ static struct mca_btl_base_descriptor_t *vader_prepare_src (struct mca_btl_base_
 
             knem_cr.iovec_array = (uintptr_t) &knem_iov;
             knem_cr.iovec_nr = 1;
-            knem_cr.protection = PROT_READ;
+            knem_cr.protection = PROT_READ | PROT_WRITE;
             /* Vader will explicitly destroy this cookie */
             knem_cr.flags = 0;
             if (OPAL_UNLIKELY(ioctl(mca_btl_vader.knem_fd, KNEM_CMD_CREATE_REGION, &knem_cr) < 0)) {