[Patch, fortran] PR28201 and PR20844 - two more one liners.

[Paul Thomas]

Ping

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> PR28201: Here resolve_generic_s would go charging off to try to find a 
> generic interface in the parent namespace, if it existed.  This is 
> fine normally but, in the case of a use associated symbol, the parent 
> namespace exists but there is no guarantee that an appropriately named 
> symbol will be found there!  In the case of the testcase, this is not 
> so and the ICE ensues.  The patch simply prevents the search in the 
> parent namespace, if the initial symbol is use asscoaited.
>
> PR20844: This has had my name next to it in Bugzilla for an 
> embarrassing amount of time.  The standard(9.4.1) constrains ADVANCE 
> specifiers to appear with an explicit FORMAT specification.  The 
> condition includes dt->namelist == NULL to prevent the corresponding 
> NAMELIST error from being overwritten. The error is tested by an 
> additional line in io_constraints_2.f90
>
Paul