Bug path

test_2
‘test_2’: events 1-3
13 void *p = malloc (1024); /* { dg-message "allocated here" } */
^~~~~~~~~~~~~
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(1) allocated here
[...]
17 free (p);
~~~~~~~~
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(2) first ‘free’ here
18 free (global_ptr); /* { dg-warning "double-'free' of 'p'" } */
~~~~~~~~~~~~~~~~~
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(3) second ‘free’ here; first ‘free’ was at (2)