Fix compiler warning (the comparison will always evaluate as ‘true’ for ZEND_OBSERVER_DATA(func) != NULL)

[arnaud-lb]

This fixes the following warning with gcc 14:

ext/zend_test/observer.c: In function ‘zend_test_observer_OnUpdateCommaList’:
ext/zend_test/observer.c:318:115: error: the comparison will always evaluate as ‘true’ for the pointer operand in ‘(((long unsigned int)func->common.run_time_cache__ptr & 1) != 0 ? (void **)*((void **)compiler_globals.map_ptr_base + (sizetype)func->common.run_time_cache__ptr) : func->common.run_time_cache__ptr) + (((unsigned char)func->type) != 1 ? (sizetype)((long unsigned int)zend_observer_fcall_op_array_extension * 8) : (sizetype)((long unsigned int)zend_observer_fcall_internal_function_extension * 8))’ must not be NULL [-Werror=address]
  318 |                         if ((func = zend_hash_find_ptr(EG(function_table), funcname)) && ZEND_OBSERVER_DATA(func) != NULL) {
      |                                                                                                                   ^~
ext/zend_test/observer.c:341:123: error: the comparison will always evaluate as ‘true’ for the pointer operand in ‘(((long unsigned int)func->common.run_time_cache__ptr & 1) != 0 ? (void **)*((void **)compiler_globals.map_ptr_base + (sizetype)func->common.run_time_cache__ptr) : func->common.run_time_cache__ptr) + (((unsigned char)func->type) != 1 ? (sizetype)((long unsigned int)zend_observer_fcall_op_array_extension * 8) : (sizetype)((long unsigned int)zend_observer_fcall_internal_function_extension * 8))’ must not be NULL [-Werror=address]
  341 |                                 if ((func = zend_hash_find_ptr(EG(function_table), funcname)) && ZEND_OBSERVER_DATA(func) != NULL) {
      |                                                                                                                           ^~

This looks similar to #13923, but I believe that the warning is right in this case: ZEND_OBSERVER_DATA(func) can not be NULL as it takes the address of ZEND_OP_ARRAY_EXTENSION(...).

[iluuu1994]

There was a short discussion, in case you missed it:
#16438 (review)

[arnaud-lb]

Ah, I missed it. Thank you!

[iluuu1994]

@cmb69 Would it be ok to merge this for now? It will be blocking the upgrade to Ubuntu 24.04, where this warning appears, without dropping -Werror.

[cmb69]

@iluuu1994, oh, totally missed the proper fix (busy with Windows lib updates). So yes, please merge this.