[patch, libfortran] Fix PR 32217, crash on unpack of zero-sized array

[Thomas Koenig]

:ADDPATCH fortran:

Hello world,

having returned from my holidays, here's a small patch that fixes PR
32217.  The problem here was that the data pointer for a zero-sized
array was dereferenced inside the library, which caused a segfault.

Regression-tested on i686-pc-linux-gnu.  Also regression-tested on PPC
with Darwin 7 by Dominique, as noted in the PR.

OK for trunk?

	Thomas

2007-07-08  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR libfortran/32217
	* intrinsics/unpack_generic.c:  If the destination array is 
	empty, return early.

2007-07-08  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR libfortran/32217
	* gfortran.dg/unpack_zerosize_1.f90:  New test case.
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