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ref: 650e5db5a2df96e8dc7a267e6831dbcce1bce9dc
parent: c5c159b17a09fd46e0ad39d9049545525a2f1a62
author: cinap_lenrek <cinap_lenrek@felloff.net>
date: Wed Feb 7 13:13:22 EST 2018

usbxhci: fix mistake in completering()

the td index "x" was incremented twice, once in for loop
and in the body expression. so r->rp only got updated
every second completion. this is wrong, but harmless.

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

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

@@ -800,7 +800,7 @@

 	pa = (*(u64int*)er) & ~15ULL;

 	ilock(r);

-	for(x = r->rp; (int)(r->wp - x) > 0; x++){

+	for(x = r->rp; (int)(r->wp - x) > 0;){

 		td = &r->base[4*(x++ & r->mask)];

 		if((u64int)PADDR(td) == pa){

 			r->rp = x;