[Patch] Fortran: Fix gfc_conv_gfc_desc_to_cfi_desc with NULL [PR104126]

[Harald Anlauf]

Hi Tobias,

Am 07.03.22 um 15:16 schrieb Tobias Burnus:
> Pre-remark: Related NULL, there some accepts-invalid issues, not 
> addressed in this
> patch. See https://gcc.gnu.org/PR104819
> 
> This patch fixes an ICE (12 regression) with NULL() that has no MOLD 
> argument.

the patch does fix the ICE.  But given your short pre-remark:
are you saying that the testcase is invalid, and with the patch
we silently accept it now?

(The testcase compiles with Intel, but triggers a funny bug in
crayftn, which made me read 16.9.144 to learn more about the
tricks of NULL.  But I tend to think this case is valid.)

> OK for mainline?

LGTM.

Thanks for the patch!

Harald

> Tobias
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