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usbehci: avoid kproc() while holding poll lock

--- a/sys/src/9/port/usbehci.c

+++ b/sys/src/9/port/usbehci.c

@@ -2278,12 +2278,15 @@

 	if(poll->must != 0 && poll->does == 0){

 		lock(poll);

-		if(poll->must != 0 && poll->does == 0){

-			poll->does++;

-			print("ehci %#p: polling\n", ctlr->capio);

-			kproc("ehcipoll", ehcipoll, hp);

+		if(poll->must == 0 || poll->does != 0) {

+			unlock(poll);

+			return;

 		}

+		poll->does++;

 		unlock(poll);

+

+		print("ehci %#p: polling\n", ctlr->capio);

+		kproc("ehcipoll", ehcipoll, hp);

 	}

 }