krnl386.exe16: Use FIELD_OFFSET for the size of structs with varlength arrays.

dlls/krnl386.exe16/atom.c

@@ -163,7 +163,7 @@ WORD WINAPI InitAtomTable16( WORD entries )
       /* Allocate the table */
 
     if (!entries) entries = DEFAULT_ATOMTABLE_SIZE;  /* sanity check */
-    handle = LocalAlloc16( LMEM_FIXED, sizeof(ATOMTABLE) + (entries-1) * sizeof(HANDLE16) );
+    handle = LocalAlloc16( LMEM_FIXED, FIELD_OFFSET( ATOMTABLE, entries[entries] ));
     if (!handle) return 0;
     table = MapSL( MAKESEGPTR( CURRENT_DS, handle ) );
     table->size = entries;

dlls/krnl386.exe16/task.c

@@ -200,7 +200,7 @@ static SEGPTR TASK_AllocThunk(void)
         sel = pThunk->next;
         if (!sel)  /* Allocate a new segment */
         {
-            sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
+            sel = GLOBAL_Alloc( GMEM_FIXED, FIELD_OFFSET( THUNKS, thunks[MIN_THUNKS] ),
                                 pTask->hPDB, WINE_LDT_FLAGS_CODE );
             if (!sel) return 0;
             TASK_CreateThunks( sel, 0, MIN_THUNKS );