rds: Fix warning.

>> net/rds/send.c:1109:42: warning: Using plain integer as NULL pointer

Fixes: ea010070 ("net/rds: fix warn in rds_message_alloc_sgs")
Reported-by: Nkbuild test robot <lkp@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/rds/send.c

@@ -1109,9 +1109,11 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len)
 		      sock_flag(rds_rs_to_sk(rs), SOCK_ZEROCOPY));
 	int num_sgs = ceil(payload_len, PAGE_SIZE);
 	int namelen;
-	struct rds_iov_vector_arr vct = {0};
+	struct rds_iov_vector_arr vct;
 	int ind;
 
+	memset(&vct, 0, sizeof(vct));
+
 	/* expect 1 RDMA CMSG per rds_sendmsg. can still grow if more needed. */
 	vct.incr = 1;