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qp: fix qpnext (was not iterating forward)

--- a/qp.c

+++ b/qp.c

@@ -103,6 +103,12 @@

 		*pv = t->leaf.v;

 		return 0;

 	}

+	if(*pk == t->leaf.k || strcmp(*pk, t->leaf.k) == 0){

+		*pk = nil;

+		*plen = 0;

+		*pv = nil;

+		return -1;

+	}

 	return -1;

 }