Minnor fix to filedlg.c

[Carlos <clozano@andago.com>]

Changelog:

  * dlls/commdlg/filedlg.c
    Avoid crashes when ofnW->lpstrFile is null.

cya.


-- 
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     ___   _____  _   ____
    / __// _   // /  / o)    clozano
   / /_ / /_/ // /_ /  \  @andago.com
  /___//_/ /_//___//__)
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Index: dlls/commdlg/filedlg.c
===================================================================
RCS file: /home/wine/wine/dlls/commdlg/filedlg.c,v
retrieving revision 1.54
diff -u -r1.54 filedlg.c
--- dlls/commdlg/filedlg.c	10 Oct 2002 21:22:11 -0000	1.54
+++ dlls/commdlg/filedlg.c	12 Oct 2002 11:42:43 -0000
@@ -687,7 +687,8 @@
     {
         if (!WideCharToMultiByte( CP_ACP, 0, ofnW->lpstrFile, -1,
                                   lfs->ofnA->lpstrFile, ofnW->nMaxFile, NULL, NULL ))
-            lfs->ofnA->lpstrFile[ofnW->nMaxFile-1] = 0;
+            if (ofnW->nMaxFile)
+               lfs->ofnA->lpstrFile[ofnW->nMaxFile-1] = 0;
         lfs->ofnA->nFileOffset = ofnW->nFileOffset;
         lfs->ofnA->nFileExtension = ofnW->nFileExtension;
     }