cli_monitor: ensure blocked children are waked up

When a command was executed, it is necessary to check not only whether the
preservation limit of the ram quota is reached, but also whether new ram quota
is available (e.g.: consequence of the kill command), and children are waiting
for additional resources.

os/src/app/cli_monitor/ram.h

@@ -30,6 +30,10 @@ class Ram
 		{
 			if (_ram.avail() < _preserve)
 				Genode::Signal_transmitter(_yield_sigh).submit();
+
+			/* verify to answer outstanding resource requests too */
+			if (_ram.avail() > _preserve)
+				Genode::Signal_transmitter(_resource_avail_sigh).submit();
 		}
 
 	public: