Bug path

test_1
‘test_1’: events 1-3
7 void *ptr = malloc (1024); /* { dg-line malloc } */
^~~~~~~~~~~~~
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(1) allocated here
8 free (ptr); /* { dg-line first_free } */
~~~~~~~~~~
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(2) first ‘free’ here
9 free (ptr); /* { dg-line second_free } */
~~~~~~~~~~
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(3) second ‘free’ here; first ‘free’ was at (2)