(layout_record, PCC_BITFIELD_TYPE_MATTERS): Fix sign bug in last change.

From-SVN: r13892

gcc/stor-layout.c

@@ -440,7 +440,7 @@ layout_record (rec)
 
 	  /* A bit field may not span more units of alignment of its type
 	     than its type itself.  Advance to next boundary if necessary.  */
-	  if ((const_size / type_align - (const_size + field_size) / type_align)
+	  if (((const_size + field_size) / type_align - const_size / type_align)
 	      > TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (field))) / type_align)
 	    const_size = CEIL (const_size, type_align) * type_align;
 	}