Host_Loadgame_f: block relative paths, like Host_Savegame_f does

git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@1396 af15c1b1-3010-417e-b628-4374ebc0bcbd

Quake/host_cmd.c

@@ -1125,6 +1125,12 @@ void Host_Loadgame_f (void)
 		Con_Printf ("load <savename> : load a game\n");
 		return;
 	}
+	
+	if (strstr(Cmd_Argv(1), ".."))
+	{
+		Con_Printf ("Relative pathnames are not allowed.\n");
+		return;
+	}
 
 	cls.demonum = -1;		// stop demo loop in case this fails