fix: fixed memory leak in sample_degseq()

Author: szhorvat

src/rinterface_extra.c

@@ -4968,6 +4968,7 @@ SEXP R_igraph_degree_sequence_game(SEXP pout_seq, SEXP pin_seq,
   SEXP result;
 
   R_SEXP_to_vector_int_copy(pout_seq, &outseq);
+  IGRAPH_FINALLY(igraph_vector_int_destroy, &outseq);
   if (!Rf_isNull(pin_seq)) {
     R_SEXP_to_vector_int_copy(pin_seq, &inseq);
   } else {
@@ -4978,7 +4979,7 @@ SEXP R_igraph_degree_sequence_game(SEXP pout_seq, SEXP pin_seq,
   PROTECT(result=R_igraph_to_SEXP(&g));
   igraph_vector_int_destroy(&outseq);
   igraph_vector_int_destroy(&inseq);
-  IGRAPH_FINALLY_CLEAN(1);
+  IGRAPH_FINALLY_CLEAN(2);
   IGRAPH_I_DESTROY(&g);
 
   UNPROTECT(1);