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rio: dont serve a kbd file per window when we didnt got one from the environment

9vx doesnt provide a /dev/kbd file and rio faking one
up causes problems with vncv. (issue #223)

--- a/sys/src/cmd/rio/dat.h

+++ b/sys/src/cmd/rio/dat.h

@@ -337,6 +337,7 @@

 int		nwindow;

 int		snarffd;

 int		gotscreen;

+int		servekbd;

 Window	*input;

 QLock	all;			/* BUG */

 Filsys	*filsys;

--- a/sys/src/cmd/rio/fsys.c

+++ b/sys/src/cmd/rio/fsys.c

@@ -365,6 +365,8 @@

 		return 1;

 	if(gotscreen && strcmp(name, "screen")==0)

 		return 1;

+	if(!servekbd && strcmp(name, "kbd")==0)

+		return 1;

 	return 0;

 }

--- a/sys/src/cmd/rio/rio.c

+++ b/sys/src/cmd/rio/rio.c

@@ -1340,6 +1340,9 @@

 	if((kfd = open("/dev/kbd", OREAD)) >= 0){

 		close(fd);

+		/* only serve a kbd file per window when we got one */

+		servekbd = 1;

+

 		/* read kbd state */

 		while((n = read(kfd, buf, sizeof(buf))) > 0)

 			chanprint(c, "%.*s", n, buf);