[patch, fortran] byte-wise access to masks

[Thomas Koenig]

Hi Brooks,

thanks for finding and reducing the bug!  This happened because
I was converting a null pointer for offset, which made a later
test for NULLness fail.  I've corrected this in pack and unpack
(which had the same problem).

the version below should correct the bug you found.  Could you
re-run the tests?

I'm also currently regtesting it on i686-pc-linux-gnu.  OK if both
tests pass?

	Thomas

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