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gefs: fix accounting on deadlist cache

this could make our deadlist cache grow too large; instead
just keep track of the number of live deadlist nodes.

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

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

@@ -56,7 +56,6 @@

 		dl->cprev->cnext = dl->cnext;

 	dl->cnext = nil;

 	dl->cprev = nil;

-	fs->dlcount--;

 }

 static Dlist*

@@ -88,6 +87,7 @@

 		return dl;

 	dl = emalloc(sizeof(Dlist), 1);

 	if(waserror()){

+		fs->dlcount--;

 		free(dl);

 		nexterror();

 	}

@@ -109,6 +109,7 @@

 	dl->hd.addr = -1;

 	dl->tl.addr = -1;

 	dl->ins = nil;

+	fs->dlcount++;

 	m.op = Oinsert;

 	dlist2kv(dl, &m, kvbuf, sizeof(kvbuf));

@@ -131,6 +132,7 @@

 		return;

 	dlcachedel(dl, 0);

 	while(fs->dlcount >= fs->dlcmax && (dt = fs->dltail) != nil){

+		fs->dlcount--;

 		dlcachedel(dt, 1);

 		dlflush(dt);

 		assert(dt->ins == nil);

@@ -144,7 +146,6 @@

 	if(fs->dlhead != nil)

 		fs->dlhead->cprev = dl;

 	fs->dlhead = dl;

-	fs->dlcount++;

 }

 void

-- 

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