Bug path

‘test_23’: events 1-2
261 int *ptr = (int *)calloc (n, sizeof (int));
^~~~~~~~~~~~~~~~~~~~~~~~
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(1) this call could return NULL
262 ptr[0] = 42; /* { dg-warning "dereference of possibly-NULL 'ptr'" } */
~~~~~~~~~~~
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(2) ‘ptr’ could be NULL: unchecked value from (1)