[Patch, fortran] PR50981 correctly handle absent arrays as actual argument to elemental procedures

[Tobias Burnus]

Mikael Morin wrote:
> there was no specific handling for absent arrays passed as argument
> to elemental procedures. So, because of scalarisation, we were passing
> an array element reference of a NULL pointer which was failing.

> These patches add a conditional to pass NULL when the data pointer
> is NULL.

> Regression tested on x86_64-unknown-freebsd9.0. OK for trunk?

OK. Thanks for the patch.

Tobias