rdma: g_malloc0() can't fail, bury dead error handling

Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Reviewed-by: NGonglei <arei.gonglei@huawei.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

migration/rdma.c

@@ -1121,9 +1121,6 @@ static int qemu_rdma_register_and_get_keys(RDMAContext *rdma,
     /* allocate memory to store chunk MRs */
     if (!block->pmr) {
         block->pmr = g_malloc0(block->nb_chunks * sizeof(struct ibv_mr *));
-        if (!block->pmr) {
-            return -1;
-        }
     }
 
     /*