[Patch, fortran] Fix elemental optional dummy argument handling

[Mikael Morin]

Hello,

I found a (unrelated) bug while playing with Andre's PR65894 patch.
The dummy argument can get out of sync with the actual argument when
there is an (optional) argument missing.
I plan to commit the attached fix as obvious later today (after testing).

Mikael


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2015-05-08  Mikael Morin  <mikael@gcc.gnu.org>

	* trans-array.c (gfc_walk_elemental_function_args):
	Don't skip the advance to the next dummy argument when skipping
	absent optional args.

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