remote: fix typo in remoteDomainOpenGraphicsFD

The remoteDomainOpenGraphicsFD method was using the wrong RPC
arg struct remote_domain_open_graphics_args instead of
remote_domain_open_graphics_fd_args. Fortunately both structs
had identical contents so there was no functional bug, but to
avoid confusing future maintainers, we should fix it.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

src/remote/remote_driver.c

@@ -6456,7 +6456,7 @@ remoteDomainOpenGraphicsFD(virDomainPtr dom,
                            unsigned int flags)
 {
     int rv = -1;
-    remote_domain_open_graphics_args args;
+    remote_domain_open_graphics_fd_args args;
     struct private_data *priv = dom->conn->privateData;
     int *fdout = NULL;
     size_t fdoutlen = 0;