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gefs: getblk(): remove duplicate getcallerpc(), check b->bp.gen from cache

--- a/sys/src/cmd/gefs/blk.c

+++ b/sys/src/cmd/gefs/blk.c

@@ -735,18 +735,15 @@

 	}

 	if((b = cacheget(bp.addr)) != nil){

 		assert(checkflag(b, 0, Bfreed));

-		b->lasthold = getcallerpc(&bp);

-		qunlock(&fs->blklk[i]);

-		poperror();

-		return b;

+		assert(b->bp.gen == bp.gen);

+	} else {

+		b = cachepluck();

+		b->alloced = getcallerpc(&bp);

+		readblk(b, bp, flg);

+		b->bp.gen = bp.gen;

+		cacheins(b);

 	}

-	b = cachepluck();

-	b->alloced = getcallerpc(&bp);

-	b->alloced = getcallerpc(&bp);

-	readblk(b, bp, flg);

-	b->bp.gen = bp.gen;

 	b->lasthold = getcallerpc(&bp);

-	cacheins(b);

 	qunlock(&fs->blklk[i]);

 	poperror();

-- 

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