win32: fix warning in timegm(3)

Building on Windows using w64devkit resulted in a new warning in
timegm(3).  The compiler didn't like a reference to the unnamed
temporary in:

   if (!is_leap) is_leap = &(int){0};

is_leap is always non-NULL in the limited version of the code used
here so the offending line can simply be removed.

1 files changed, 0 insertions, 1 deletions

diff --git a/win32/timegm.c b/win32/timegm.c
index 8bfa041c4..ac39a26f5 100644
--- a/win32/timegm.c
+++ b/win32/timegm.c
@@ -42,7 +42,6 @@ static long long __year_to_secs(long long year, int *is_leap)
                 return 31536000*(y-70) + 86400*leaps;
         }
 
-        if (!is_leap) is_leap = &(int){0};
         cycles = (year-100) / 400;
         rem = (year-100) % 400;
         if (rem < 0) {