[PATCH, committed] Fortran: fix memory leak with real to integer conversion warning

[Harald Anlauf]

Dear all,

while checking f951 for memory leaks on testcases that appeared
relevant during work on pr108924, I found that the conversion
warning triggered by do_subscript_6.f90 uses a code path that
forgot to mpfr_clear a used variable.

The attached obvious patch fixes this - verified by valgrind.

Pushed to mainline as r13-6344-g03c60e525bea13 .

Thanks,
Harald

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