Fix some K&R isms.

gdb/remote.c

@@ -254,7 +254,7 @@ struct remote_state
 static struct gdbarch_data *remote_gdbarch_data_handle;
 
 static struct remote_state *
-get_remote_state ()
+get_remote_state (void)
 {
   return gdbarch_data (current_gdbarch, remote_gdbarch_data_handle);
 }