[Patch, Fortran] PR 39304 - fix generic function issue

[Tobias Burnus]

Hi all,

PR 39304 shows two issues:
a) The wrong specific function is checked for e.g. MATMUL when using
generic functions
b) For pointer returning functions there is an issue, causing a segfault
(cf. bugreport to PR 39304 but see also PR 42851)

This patch fixes the first issue and is rather straight forward.
Build and regtested on x86-64-linux. OK for the trunk?

Tobias

PS: I used "dg-do run", one can also save computation power and simply
use "dg-do compile" which is enough for this PR; if you prefer the
latter, tell me.
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