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rio: fix memory leak with closed kbdtap (thanks aap)

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

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

@@ -352,7 +352,7 @@

 {

 	Window *cur = nil;

 	Channel *c;

-	char *s;

+	char *s, *t;

 	enum { Akbd, Aopen, Aclose, Awrite, NALT };

 	Alt alts[NALT+1] = {

@@ -397,6 +397,8 @@

 			}

 			if(c == totap)

 				totap = nil;

+			while(nbrecv(c, &t))

+				free(t);

 			chanfree(c);

 			break;

 		case Awrite: