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libplumb: fix old leak introduced in 18b8ed1a5ea3

--- a/sys/src/libplumb/mesg.c

+++ b/sys/src/libplumb/mesg.c

@@ -95,8 +95,10 @@

 	for(a=attr; a!=nil; a=a->next)

 		n += Strlen(a->name) + 1 + Strlen(quote(a->value, buf, bufe)) + 1;

 	s = malloc(n);

-	if(s == nil)

+	if(s == nil){

+		free(buf);

 		return nil;

+	}

 	t = s;

 	*t = '\0';

 	for(a=attr; a!=nil; a=a->next){