dbghelp: Fix the localization of section table while loading COFF information.

dlls/dbghelp/pe_module.c

@@ -409,7 +409,7 @@ static BOOL pe_load_coff_symbol_table(struct module* module)
     isym = (const IMAGE_SYMBOL*)((const char*)mapping + fmap->u.pe.ntheader.FileHeader.PointerToSymbolTable);
     /* FIXME: no way to get strtable size */
     strtable = (const char*)&isym[numsym];
-    sect = IMAGE_FIRST_SECTION(&fmap->u.pe.ntheader);
+    sect = IMAGE_FIRST_SECTION(RtlImageNtHeader((HMODULE)mapping));
 
     for (i = 0; i < numsym; i+= naux, isym += naux)
     {