Improve error string if nfs_mount fails in the rpc layer.

Signed-off-by: sahlberg <[email protected]>

lib/libnfs-sync.c

@@ -365,6 +365,7 @@ nfs_mount(struct nfs_context *nfs, const char *server, const char *export)
                 rpc_disconnect(nfs->rpc, "disconnect to try different dialect");
                 ret = _nfs_mount(nfs, server, export);
         }
+        nfs_set_error(nfs, rpc_get_error(nfs->rpc));
 
         return ret;
 }