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mq-cat: null-terminate correct buffer

--- a/src/mq-cat.c

+++ b/src/mq-cat.c

@@ -98,7 +98,7 @@

 	for(;;){

 		if((n = read(orderfd, name, sizeof(name)-1)) == 0)

 			break;

-		buf[n] = 0;

+		name[n] = 0;

 		for(i = 0, s = streams; i < nstreams; i++, s++){

 			if(strcmp(s->name, name) != 0 || s->fd == -1)

 				continue;