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util: fix vector pop

--- a/util.c

+++ b/util.c

@@ -71,8 +71,10 @@

 void

 popsparsevec(Vector *v, int n)

 {

-	assert(v != nil && v->elsz > 0 && n >= 0 && n <= v->n);

+	assert(v != nil && v->elsz > 0 && n >= 0 && n < v->n);

 	memset((uchar *)v->p + n * v->elsz, 0, v->elsz);

+	if(n < v->firstempty)

+		v->firstempty = n;

 }

 /* assumes that zeroed element means empty; could fill with