libthread: typo in comment
 [rsc] --rw-rw-r-- M 1635703 rsc sys 880 Feb 23 06:44 sys/src/libthread/iocall.c
	/n/sourcesdump/2006/0223/plan9/sys/src/libthread/iocall.c:29,35 - 
	/n/sourcesdump/2006/0224/plan9/sys/src/libthread/iocall.c:29,35
	  	}
	  
	  	/*
	- 	 * If we get interrupted, we have stick around so that
	+ 	 * If we get interrupted, we have to stick around so that
	  	 * the IO proc has someone to talk to.  Send it an interrupt
	  	 * and try again.
	  	 */