numeric.c: fix return value on big 0

* numeric.c (num_zero_p): should return true if zero.
  rb_bigzero_p returns 1 or 0.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56538 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 1 deletions

diff --git a/numeric.c b/numeric.c
index 21e8eeeb8e..9a9b8d0b44 100644
--- a/numeric.c
+++ b/numeric.c
@@ -721,7 +721,10 @@ num_zero_p(VALUE num)
 	}
     }
     else if (RB_TYPE_P(num, T_BIGNUM)) {
-	return rb_bigzero_p(num);
+	if (rb_bigzero_p(num)) {
+	    /* this should not happen usually */
+	    return Qtrue;
+	}
     }
     else if (rb_equal(num, INT2FIX(0))) {
 	return Qtrue;