util.c: do not underflow

* util.c (ruby_strtod): do not underflow only by preceeding zeros,
  which may be canceled out by the exponent.
  http://twitter.com/kazuho/status/753829998767714305

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55689 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/util.c b/util.c
index 0b0c935832..17819e522a 100644
--- a/util.c
+++ b/util.c
@@ -2145,7 +2145,7 @@ break2:
         for (; c >= '0' && c <= '9'; c = *++s) {
 have_dig:
             nz++;
-            if (nf > DBL_DIG * 4) continue;
+            if (nd > DBL_DIG * 4) continue;
             if (c -= '0') {
                 nf += nz;
                 for (i = 1; i < nz; i++)