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nusb/cam: ctl message fixes

--- a/sys/src/cmd/nusb/cam/cam.c

+++ b/sys/src/cmd/nusb/cam/cam.c

@@ -202,6 +202,11 @@

 {

 	ReadState *rs;

+	if(req->fid->aux != nil){

+		free(((ReadState*)req->fid->aux)->buf);

+		free(req->fid->aux);

+		req->fid->aux = nil;

+	}

 	if(str == nil)

 		return;

 	rs = emallocz(sizeof(ReadState), 1);

@@ -223,7 +228,7 @@

 	}

 	f = req->fid->file;

 	c = f->aux;

-	if(req->fid->aux == nil)

+	if(req->fid->aux == nil || req->ifcall.offset == 0)

 		if(f == c->formatsfile)

 			strread(req, formatread(c), -1);

 		else if(f == c->ctlfile)

@@ -267,8 +272,10 @@

 	werrstr("invalid argument");

 	if(ctlwrite(c, s) < 0)

 		responderror(req);

-	else

+	else{

+		req->ofcall.count = req->ifcall.count;

 		respond(req, nil);

+	}

 	free(s);

 }

--- a/sys/src/cmd/nusb/cam/ctl.c

+++ b/sys/src/cmd/nusb/cam/ctl.c

@@ -507,7 +507,7 @@

 		p = findparam(f[1]);

 		if(p == nil)

 			return -1;

-		if((uint)uid >= nunit || unit[uid] == nil){

+		if(p->type != PARAMSPEC && ((uint)uid >= nunit || unit[uid] == nil)){

 			werrstr("no such unit");

 			return -1;

 		}