Bug path

‘test_23a’: events 1-2
268 int *ptr = (int *)__builtin_calloc (n, sizeof (int));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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(1) this call could return NULL
269 ptr[0] = 42; /* { dg-warning "dereference of possibly-NULL 'ptr'" } */
~~~~~~~~~~~
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(2) ‘ptr’ could be NULL: unchecked value from (1)