[PATCH] widl: Add null source pointer check for typelib writer.

[Nikolay Sivov]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=38964
Signed-off-by: Nikolay Sivov <nsivov(a)codeweavers.com>
---

All other locations already test for it.

 tools/widl/write_msft.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/widl/write_msft.c b/tools/widl/write_msft.c
index aa05dcfe567..440bb23f79b 100644
--- a/tools/widl/write_msft.c
+++ b/tools/widl/write_msft.c
@@ -2560,7 +2560,8 @@ static void set_lib_flags(msft_typelib_t *typelib)
 
 static void ctl2_write_segment(msft_typelib_t *typelib, int segment)
 {
-    put_data(typelib->typelib_segment_data[segment], typelib->typelib_segdir[segment].length);
+    if (typelib->typelib_segment_data[segment])
+        put_data(typelib->typelib_segment_data[segment], typelib->typelib_segdir[segment].length);
 }
 
 static void ctl2_finalize_typeinfos(msft_typelib_t *typelib, int filesize)
-- 
2.28.0