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lib9p: improve reqqueuecreate()

- open /proc/n/ctl with OCEXEC flag
- format pid as ulong
- don't leak the fd

--- a/sys/src/lib9p/queue.c

+++ b/sys/src/lib9p/queue.c

@@ -16,8 +16,8 @@

 	q = v;

 	rfork(RFNOTEG);

-	buf = smprint("/proc/%d/ctl", getpid());

-	fd = open(buf, OWRITE);

+	buf = smprint("/proc/%lud/ctl", (ulong)getpid());

+	fd = open(buf, OWRITE|OCEXEC);

 	free(buf);

 	for(;;){

@@ -40,6 +40,8 @@

 		f(r);

 	}

+	if(fd >= 0)

+		close(fd);

 	free(r);

 	free(q);

 	threadexits(nil);