James Larrowe : winebuild: Fix a segmentation fault.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: f97636bc494bef29073ed441e27ca8bd1f89c178
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=f97636bc494bef29073ed441e27ca8bd1f89c178

Author: James Larrowe <larrowe.semaj11 at gmail.com>
Date:   Sat Jan 12 17:01:08 2019 -0500

winebuild: Fix a segmentation fault.

When 'winebuild' is called with no arguments, the make_c_identifier
function is passed a null pointer, which is dereferenced and causes
a segmentation fault.

Signed-off-by: James Larrowe <larrowe.semaj11 at gmail.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 tools/winebuild/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/winebuild/main.c b/tools/winebuild/main.c
index 70f381c..b2f5c95 100644
--- a/tools/winebuild/main.c
+++ b/tools/winebuild/main.c
@@ -164,7 +164,7 @@ static void init_dll_name( DLLSPEC *spec )
         spec->dll_name = xstrdup( spec->file_name );
         if ((p = strrchr( spec->dll_name, '.' ))) *p = 0;
     }
-    spec->c_name = make_c_identifier( spec->dll_name );
+    if (spec->dll_name) spec->c_name = make_c_identifier( spec->dll_name );
 }
 
 /* set the dll subsystem */