rds: Fix warning.

[ Upstream commit d84e7bc0595a7e146ad0ddb80b240cea77825245 ]

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

Fixes: ea010070d0a7 ("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>
Signed-off-by: NSasha Levin <sashal@kernel.org>

net/rds/send.c

@@ -1106,9 +1106,11 @@ 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;