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usbxhci: eliminate "set but not used" warning

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

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

@@ -1353,7 +1353,6 @@

 				memmove(p, d, n);

 				io->nleft += n;

 				p += n;

-				n = 0;

 				break;

 			}

 			dmaflush(0, d, m);