winhelp[3/3]: Fix possible copy/paste error.

[Kirill K. Smirnov]

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diff --git a/programs/winhelp/hlpfile.c b/programs/winhelp/hlpfile.c
index 15ca70f..e7ae75e 100644
--- a/programs/winhelp/hlpfile.c
+++ b/programs/winhelp/hlpfile.c
@@ -2243,7 +2243,7 @@ static BOOL HLPFILE_UncompressLZ77_Phras
     }
 
     for (i = 0; i <= num; i++)
-        hlpfile->phrases_offsets[i] = GET_USHORT(buf, 0x11 + 2 * i) - 2 * num - 2;
+        hlpfile->phrases_offsets[i] = GET_USHORT(buf, head_size + 2 * i) - 2 * num - 2;
 
     if (hlpfile->version <= 16)
         memcpy(hlpfile->phrases_buffer, buf + 15 + 2*num, dec_size);