PAD macro

[matsunaga]

Hi 

This is really a trivial thing, 
but there are places where PAD macro is not used for 4byte alignment.
I think it would be better to be unified.

scan.c, line 357 ofs = (ofs+3)&~3;
dir.c,  line 359 writtenlen = (writtenlen+3)&~3;
dir.c,  line 656 writtenlen = (writtenlen+3)&~3;

Best regards.

Matsunaga.
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