winhelp[1/3]: we can reference to any page in HLPFILE_BrowsePage(). Perform similar change in HLPFILE_DoReadHlpFile() for the symmetry.

[Kirill K. Smirnov]

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diff --git a/programs/winhelp/hlpfile.c b/programs/winhelp/hlpfile.c
index f5935a1..ca46d3a 100644
--- a/programs/winhelp/hlpfile.c
+++ b/programs/winhelp/hlpfile.c
@@ -327,7 +327,7 @@ static BOOL HLPFILE_DoReadHlpFile(HLPFIL
             offset = (ref - 0x0C) & 0x3FFF;
         }
 
-        if (hlpfile->version <= 16 && index != old_index && index != 0)
+        if (hlpfile->version <= 16 && index != old_index && old_index != -1)
         {
             /* we jumped to the next block, adjust pointers */
             ref -= 12;
@@ -1770,7 +1770,7 @@ BOOL    HLPFILE_BrowsePage(HLPFILE_PAGE*
             offset = (ref - 0x0C) & 0x3FFF;
         }
 
-        if (hlpfile->version <= 16 && index != old_index && index != 0)
+        if (hlpfile->version <= 16 && index != old_index && old_index != -1)
         {
             /* we jumped to the next block, adjust pointers */
             ref -= 12;