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omap: remove Block refcounting

--- a/sys/src/9/omap/ucallocb.c

+++ b/sys/src/9/omap/ucallocb.c

@@ -33,8 +33,6 @@

 	b->list = nil;

 	b->free = 0;

 	b->flag = 0;

-	b->ref = 0;

-	_xinc(&b->ref);

 	/* align start of data portion by rounding up */

 	addr = (ulong)b;

@@ -117,15 +115,9 @@

 ucfreeb(Block *b)

 {

 	void *dead = (void*)Bdead;

-	long ref;

-	if(b == nil || (ref = _xdec(&b->ref)) > 0)

+	if(b == nil)

 		return;

-

-	if(ref < 0){

-		dumpstack();

-		panic("ucfreeb: ref %ld; caller pc %#p", ref, getcallerpc(&b));

-	}

 	/*

 	 * drivers which perform non cache coherent DMA manage their own buffer